Malicious PDF — malware analysis report

Static analysis result for SHA-256 f168ed7283143e87…

MALICIOUS

PDF

78.3 KB Created: 2021-06-09 14:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: acc5fc923cef7e36bddc0c47aedc8cce SHA-1: cc2800073d71df595c8867493b385628605f6b64 SHA-256: f168ed7283143e87af761f44bc64fcf70d3bee54fcdbd9bad3bc55652accb7a9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics indicate a non-standard use of PDF for SEO manipulation or to redirect users to potentially malicious content. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/pbw?utm_term=indian+best+app+lock PDF link annotation
    • https://rikovikoxeko.weebly.com/uploads/1/3/2/7/132740842/befefaefd0.pdfIn PDF document text
    • https://niduzipotobumam.weebly.com/uploads/1/3/6/0/136054567/fotipe-sasadizof-naraduvuxafujus.pdfIn PDF document text
    • https://bevevigulamop.weebly.com/uploads/1/3/4/7/134759368/xobaxulalezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427077/normal_6067c7d24142c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5ffe747092734.pdfIn PDF document text
    • https://jepusujejo.weebly.com/uploads/1/3/4/5/134598091/zolixirove-dawisu-develevajiw-vigepadifoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394060/normal_600f46a0ed48d.pdfIn PDF document text
    • https://pivikupawo.weebly.com/uploads/1/3/4/3/134356995/jarixekupifopelukaje.pdfIn PDF document text
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/fegopiretite-bisije.pdfIn PDF document text
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/5966214.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417205/normal_604906bd2a5fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_602f5724c9620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_605476aa10eea.pdfIn PDF document text
    • https://xinorexuvon.weebly.com/uploads/1/3/4/6/134608307/wipem_zomokuzaw_lekuvux.pdfIn PDF document text
    • https://mugabezimezik.weebly.com/uploads/1/3/4/2/134235171/kuwak_rolerusuwejisoz_wowaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485568/normal_60bd0380b73b4.pdfIn PDF document text
    • https://powufaru.weebly.com/uploads/1/3/5/3/135310655/mexakinesiso-piduj.pdfIn PDF document text
    • https://nipizizit.weebly.com/uploads/1/3/0/9/130969905/43cddb.pdfIn PDF document text
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/pujeratesevitizad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5ffb96adc0eef.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/b74ccc457b0f22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_6052c22979d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425211/normal_60461fb08cb50.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/a54c48024f8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/887d44dd-2014-4c71-8e21-f7eedb789c09/honeywell_thermostat_th8320u1008_unlock_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f33fdc92-cd33-446a-a471-aa800d6d34e9/junovakuleselinubikepad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7fa2ea-bebb-464f-97ae-9b882e42c1f2/faboluvutis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f059df-30ab-4268-b5c3-fd3be43cf3e9/how_to_make_i12_louder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcf7e16-d1da-41b4-9d0e-e2fcdf398959/apa_makna_hari_raya_idul_fitri_bagi_umat_islam.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 5112 bytes
SHA-256: 630f41d8f0adea3a5960d44af6330ed5cca8459e662cbee80ce825c97f49db46
font_01_sfnt_off00010561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10561 11088 bytes
SHA-256: a5e3d9728cc97bba83e7e495fe0f063ffb54cb6635cc72bdbea5b4b072899540

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