Malicious PDF — malware analysis report

Static analysis result for SHA-256 3611c1bade20c374…

MALICIOUS

PDF

79.3 KB Created: 2021-06-02 11:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8fe6af3f83183ceebc4b128aa7ef6995 SHA-1: 537fecfd9543bea6a59a24e41b986535a0fd1bc4 SHA-256: 3611c1bade20c374ee1406584addcbfd4e94159de10e516577ef01684493f7c4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/123?utm_term=dls+18+kits+barcelona PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470968/normal_60481a833d2a7.pdfIn PDF document text
    • https://mepowisa.weebly.com/uploads/1/3/4/5/134595914/rozimu.pdfIn PDF document text
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/lonixavazoluwezirup.pdfIn PDF document text
    • https://merudaxesu.weebly.com/uploads/1/3/1/3/131383629/waxoju_wojujivumav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_603bdb0f7e077.pdfIn PDF document text
    • https://wegolabama.weebly.com/uploads/1/3/4/5/134511146/guvopesojotufo.pdfIn PDF document text
    • https://muluxebaxomoj.weebly.com/uploads/1/3/5/4/135401331/bafusonape.pdfIn PDF document text
    • https://luxisawevevolal.weebly.com/uploads/1/3/2/6/132682936/8482876.pdfIn PDF document text
    • https://xafadatez.weebly.com/uploads/1/3/4/4/134478609/katubo_nekesalaxim_kidadufarasakus_baloku.pdfIn PDF document text
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/6024250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493245/normal_5fcaf7eb95913.pdfIn PDF document text
    • https://ladipepisosixas.weebly.com/uploads/1/3/4/8/134898905/fevuvuri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381318/normal_604854f5801e2.pdfIn PDF document text
    • https://luwuberukad.weebly.com/uploads/1/3/1/4/131409546/e694bb2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kolasotosexu.pbworks.com/f/the_tenth_insight_audiobook.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144484092/40451945830.pdfIn PDF document text
    • http://nigezid.pbworks.com/f/60458739228.pdfIn PDF document text
    • http://sofutikajen.pbworks.com/w/file/fetch/144476343/answering_machine_not_picking_up.pdfIn PDF document text
    • http://lerepaxa.pbworks.com/w/file/fetch/144495159/introduction_to_classifying_matter_answer_key.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/farewell_speech_for_students_in_assamese.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/77457076726.pdfIn PDF document text
    • http://paditoxef.pbworks.com/w/file/fetch/144492387/47071925474.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144428409/xasurinusimasamazubaj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 5240 bytes
SHA-256: 008eef4a78bdb168e73e64635f2da5de816e9b2a3f88ac04acb8d35b4c090262
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 10876 bytes
SHA-256: a1a243e24a94b98411970a1020585ccb444885994a69cdc0dc6fd00cf39126c3
font_02_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd