Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbc35fa3419fae4…

MALICIOUS

PDF

75.3 KB Created: 2021-03-31 13:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6c06a7f9456398e7c1bf3982b4c22c77 SHA-1: 2b99a39793418e891ff626dbc30d9e04c8b97c4a SHA-256: 3bbc35fa3419fae41a1334e6de800b34e6599e4198ca5571d82e960ab23c2f54
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF's structure point towards an attempt to exploit user trust by masquerading as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/award?keyword=salary+agreement+letter+pdf PDF link annotation
    • https://kujedoduzenawo.weebly.com/uploads/1/3/0/7/130776750/8884ab48de9f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_60379b6859674.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/40bc1d41681.pdfIn PDF document text
    • http://bellissimo.online/waifu_wars_commands2tp8t.pdfIn PDF document text
    • https://xupubiwe.weebly.com/uploads/1/3/4/3/134339906/bagulozubav-pimexijol.pdfIn PDF document text
    • http://prostosite.site/mountain_bike_helmets_for_sale_south_africauvf1s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414867/normal_5ff68893ce203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_600d5ea5e2c34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_60381e86cb800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_5fe81d34af2fe.pdfIn PDF document text
    • http://lnstagramverifiedbadge-media.com/94284967087gj7l2.pdfIn PDF document text
    • http://gelchlen.fun/162897949593s5xp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6045bce9836ef.pdfIn PDF document text
    • https://suzotavuni.weebly.com/uploads/1/3/4/7/134765747/masud.pdfIn PDF document text
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/wavuburamezukul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_ac5caa8a568c455bae9cd16b5921c5e7.pdf?index=trueIn PDF document text
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_022b5dc2307041519a38033322e43980.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_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 5388 bytes
SHA-256: e08ff1de9380d64387f07830dfc8492e8e7b8788f36ac82a714026101949f0ed
font_01_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 10752 bytes
SHA-256: 3d4f63dc7abe643e0bc5ba31a8702a34b1fd08f4cbed013d83daafc537dd2292

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