Malicious PDF — malware analysis report

Static analysis result for SHA-256 4618ec4aa68089c1…

MALICIOUS

PDF

82.3 KB Created: 2021-04-24 21:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7e5b83e953cd1319582a49bb7a77c06b SHA-1: 790abd2e60c7d0106d4c8f6120543d9f3d92a291 SHA-256: 4618ec4aa68089c1d1dadfdcc0b41d7317aa50eaabc9efb41cd034df00471bb0
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm. The document body, though heavily obfuscated, suggests a lure related to reading stories online. The presence of multiple PDF link farm heuristics and ClamAV detection strongly suggests malicious intent, likely to drive traffic to advertising or potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=read+very+short+stories+online+by+indian+authors PDF link annotation
    • https://bopilewe.weebly.com/uploads/1/3/4/5/134523270/fowufosom-wogesuvolu-natiwoz-tisutaxipito.pdfIn PDF document text
    • https://riwewupurudo.weebly.com/uploads/1/3/1/3/131381540/2197343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fde5dd1a3e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454162/normal_606678d3c7b77.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/vjjwhdf/nihilumbra_pc_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_601f741bd9a08.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/picture_of_matrix_organizational_chart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469119/normal_5fd8cf2a8232b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_606e19c42d33e.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/bohm_bawerk_marx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490121/normal_60079bc716580.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/ihkQ3ji/44128967886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_6032599d92598.pdfIn PDF document text
    • https://cdn.sqhk.co/banifiga/if6jgNr/nike_outlet_coupon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467019/normal_6003e122e4188.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/nupezuvelodijareluw.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/noxibibeponomaken.pdfIn PDF document text
    • https://rufuwoja.weebly.com/uploads/1/3/4/7/134735928/sajenekonokujojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384159/normal_60333e15804b1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9b08d158-0e0f-4203-9b31-e1272d977b1c.filesusr.com/ugd/086daf_a5f491e86ef3405cb5e2bf3faf95e5d5.pdf?index=trueIn PDF document text
    • https://70a023e4-b173-4b34-8ac5-854d526a16b0.filesusr.com/ugd/5aec30_136e93bb762d4c5d9b030fd4da693c57.pdf?index=trueIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_42caa6b3bb0040f78f972d3edf8d3fec.pdf?index=trueIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_daa428bf25b84da2a3c94f2332b57a7f.pdf?index=trueIn 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_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 5220 bytes
SHA-256: d8fa96780c979b2a2a520900b762ab7bfca4f43de80fba751f34623ee828bdfa
font_01_sfnt_off00011491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11491 11732 bytes
SHA-256: 4b9adb5e0080186585a36fb936d549b98248841adafc03eace9fed2a6422a6bf