Malicious PDF — malware analysis report

Static analysis result for SHA-256 391581e730e942eb…

MALICIOUS

PDF

83.4 KB Created: 2021-03-11 20:17:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b7bedeee59e92612cb0758c42da9ae3 SHA-1: d88fcbe1af1ee994f7b9343108dafa889317567d SHA-256: 391581e730e942eb7c31b6b84a18f477666c8f6f0f5f2ff4ce2a604014ee5fe5
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be related to movie search terms, likely a lure to disguise the malicious intent of directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/123?utm_term=2019+hollywood+horror+movies++in+tamil
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fd271e5e9d10.pdf
    • https://cdn.sqhk.co/dijogiper/Tvhhgh1/whatsapp_animated_stickers_maker_android.pdf
    • https://cdn-cms.f-static.net/uploads/4406782/normal_60345c2bafbb8.pdf
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fed806b304c6.pdf
    • https://cdn-cms.f-static.net/uploads/4367643/normal_6036332b3c07c.pdf
    • https://cdn.sqhk.co/midijanere/01jihaU/amazon_kindle_books_cancel_order.pdf
    • https://wexopusipomela.weebly.com/uploads/1/3/5/3/135313487/subowuf.pdf
    • https://cdn.sqhk.co/noviraxat/ihdjbja/pogromcy_duchow_2_zwiastun.pdf
    • https://wejilosadala.weebly.com/uploads/1/3/0/8/130815097/7926953.pdf
    • https://cdn-cms.f-static.net/uploads/4415769/normal_6017c4399a6fd.pdf
    • https://cdn.sqhk.co/zibepidok/dEjfagd/18564437054.pdf
    • https://cdn-cms.f-static.net/uploads/4491927/normal_603cac6bcf9f2.pdf
    • https://cdn-cms.f-static.net/uploads/4393908/normal_601eb8e4ad446.pdf
    • https://luwupedo.weebly.com/uploads/1/3/1/3/131383743/3173659.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tomaxade/football_manager_2019_team_guide.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/biwavavonojoboxo.pdf
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_64118c8954d5483fa9e3f0d3de61939c.pdf?index=true
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_43eda195216941c087961e1cd6e368ff.pdf?index=true
    • https://s3.amazonaws.com/dexodekelaseki/blood_sweat_and_tears.pdf
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_2da3cb06c309498da33c4691194d3f45.pdf?index=true
    • https://s3.amazonaws.com/numunenoji/number_of_abortions_performed_in_2018.pdf
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_dceb2db9a2ce44c18ca2479304aaa42f.pdf?index=true
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_143421e35e9d46709e9eaf2e012d3fd8.pdf?index=true
    • 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_off000107df.bin
1e0c4febe731bad64f91ee01d00a5bec693a21cfd8733cf9dd5022278dcb550a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 5704 bytes
font_01_sfnt_off00011b3d.bin
2d70c28a0034e2145f6bb6ebd8fbe8aa0e0444d1710ec2aa891ea537e264713d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3D 10720 bytes

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