Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4fc2c301e77047…

MALICIOUS

PDF

81.2 KB Created: 2021-03-09 06:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4648d22199a79929f23fbb50c403dc21 SHA-1: dc7ab4aa1885a02ba65bddbed456b0051ddc25aa SHA-256: 3e4fc2c301e77047119964c32c88a53185056e9fa7f96cc5fc0426de0b43109c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm designed to distribute malicious content or facilitate phishing. The primary URL, 'https://xezojetit.ru/123?utm_term=adobe+photoshop+tutorials+free++pdf', is presented as a free PDF tutorial, which is a common lure for users. No scripts were extracted, but the extensive linking and detection results point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/123?utm_term=adobe+photoshop+tutorials+free++pdf
    • https://xujikipige.weebly.com/uploads/1/3/1/3/131379844/kewoliwire.pdf
    • https://rofixuninapo.weebly.com/uploads/1/3/5/3/135313709/52b8dae5db12.pdf
    • https://xidamosu.weebly.com/uploads/1/3/4/7/134707329/rugowefonofevum.pdf
    • https://cdn-cms.f-static.net/uploads/4391317/normal_601632bdc6ec3.pdf
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/ee3578f3.pdf
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/0727a193.pdf
    • https://mefiwoteta.weebly.com/uploads/1/3/5/9/135956645/faxil-fuzego.pdf
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/movapuvulopobujib.pdf
    • https://sizugive.weebly.com/uploads/1/3/5/9/135993047/xazotuwej.pdf
    • https://cdn-cms.f-static.net/uploads/4448985/normal_5fe7ab1038504.pdf
    • https://zutekavewer.weebly.com/uploads/1/3/4/5/134514418/pixivimivun.pdf
    • https://rezedutusijilik.weebly.com/uploads/1/3/2/7/132710703/8015369.pdf
    • https://vufujisuwe.weebly.com/uploads/1/3/1/4/131437295/gejetadarex.pdf
    • https://static.s123-cdn-static.com/uploads/4457272/normal_5ff81b473073e.pdf
    • https://static.s123-cdn-static.com/uploads/4379032/normal_60097b6632156.pdf
    • http://kitufavurakural.iblogger.org/66629497163.pdf
    • https://pemiroma.weebly.com/uploads/1/3/1/3/131383733/5579673.pdf
    • http://rifimakegezibor.22web.org/domizuzanefene.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bidurudilidujug/b_movies_apk.pdf
    • http://katurew.epizy.com/13689095106.pdf
    • http://terexibuf.epizy.com/whirlpool_dishwasher_quiet_partner_iii_manual.pdf
    • https://s3.amazonaws.com/fipijife/keto_meal_plan_worksheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010078.bin
c7c849f8e063d5a8da13e65fab84372711d8b831f80e9fb11db2725eef4ee62d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 5256 bytes
font_01_sfnt_off0001124d.bin
8016a929a372aba9d18f88b9e7ccdfe08b68e42b14cd0c72e590b6b9ac19c42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 10708 bytes

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