Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae61d7f313150fb…

MALICIOUS

PDF

88.8 KB Created: 2021-04-08 03:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 110cd55845c53c742fd47c6dddde71fa SHA-1: 79396346a78830c4c66930d6777c9e38a94d51ed SHA-256: dae61d7f313150fb6033d6adf21d44c46d56aa484f7d23a02ce2cd1ffc9a113e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which are structured as SEO-friendly URLs, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' indicates the document's content is designed to trick users into believing they are involved in a lottery, prize, or parcel delivery scam, which is a common tactic for advance-fee fraud. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://jacksth.ru/wix?keyword=logic+problems+x2+camping+spaces+grid+answers
    • https://cdn.sqhk.co/ruzemesafe/kjhibHg/bodyguard_protect_the_president_2019_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4371272/normal_5ff0e61530153.pdf
    • https://cdn-cms.f-static.net/uploads/4448332/normal_603ff4441775a.pdf
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5ff04771dc5da.pdf
    • https://cdn-cms.f-static.net/uploads/4369327/normal_60328e486ca4c.pdf
    • https://cdn-cms.f-static.net/uploads/4382201/normal_605dba418255e.pdf
    • https://cdn.sqhk.co/tuxonewebuke/ghfN6Cz/29318775631.pdf
    • https://cdn-cms.f-static.net/uploads/4420767/normal_606ae66abfd07.pdf
    • https://cdn-cms.f-static.net/uploads/4379471/normal_6045111d4e8d1.pdf
    • https://cdn-cms.f-static.net/uploads/4407313/normal_60466885bdd6d.pdf
    • https://cdn-cms.f-static.net/uploads/4372681/normal_6065a1d43b6d4.pdf
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5ffb80242142b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_593a548b84df4b898db6722f53fb51b0.pdf?index=true
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_eea6bba77a2748b7afdf7a201f7f9782.pdf?index=true
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_073a1c523c28492bbaeb9cd445110d70.pdf?index=true
    • https://s3.amazonaws.com/tiduro/balance_sheet_depreciation_expense.pdf
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_107a6ec25b4c416b890793f12bc3f5f6.pdf?index=true
    • https://s3.amazonaws.com/lanorolowu/ranger_2020_towing_capacity.pdf
    • https://s3.amazonaws.com/gidibesuxi/2063866745.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a2f.bin
514d5a0795011ed85d0a363cbac6133e75ec3b023add66cbedd4c96c66ac13a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 5476 bytes
font_01_sfnt_off00011cbc.bin
972d259af27284c015d4a87d166f9ec8ce3b6d807a8bb2acb75c201a5d84bd32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 12740 bytes
font_02_sfnt_off00014759.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14759 4324 bytes

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