Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfa8e7ff7b2aba7…

MALICIOUS

PDF

77.1 KB Created: 2021-02-24 02:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7d91e28eb369f02dcf5f9f633b7cef54 SHA-1: 6a64b0abc981a2a2880ec4fed8fe0d54ec5d8cda SHA-256: 4cfa8e7ff7b2aba7a27602cbbf6494bb90f4ed93d297ce866a611f82380d1f08
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://druttle.ru/123?utm_term=convert+lexile+to+ar+level PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4447884/normal_5fcdcf3253986.pdfIn PDF document text
    • http://options.expert/tawugomojidinclxg.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/h1jj7nY/license_plate_lookup_canada.pdfIn PDF document text
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/vapegipotimolafu.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwegamuvev/hghgGih/7125909200.pdfIn PDF document text
    • https://fogakorix.weebly.com/uploads/1/3/3/9/133997140/6126168.pdfIn PDF document text
    • https://xadularapiro.weebly.com/uploads/1/3/1/4/131437383/vatanatojon.pdfIn PDF document text
    • http://itrom.fun/fenopewoxidedalplkkd.pdfIn PDF document text
    • https://fonuwinozizanam.weebly.com/uploads/1/3/1/4/131408397/3292614.pdfIn PDF document text
    • https://wejapunikiver.weebly.com/uploads/1/3/4/2/134266614/jituv.pdfIn PDF document text
    • http://buyfastedcircle.xyz/98878362883qpxoa.pdfIn PDF document text
    • https://cdn.sqhk.co/nijegonusas/4gjZgf3/99237027777.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417313/normal_6005a3a53ece3.pdfIn PDF document text
    • https://nezovudaposuru.weebly.com/uploads/1/3/0/9/130969726/345012.pdfIn PDF document text
    • https://dojunulopifo.weebly.com/uploads/1/3/4/4/134445836/9044174.pdfIn PDF document text
    • https://cdn.sqhk.co/gapalagabig/ejfgpjj/sentinels_of_the_multiverse_solo_variant.pdfIn PDF document text
    • http://topstop.site/basic_command_prompt_commands_windows_10yfxp0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/domegagowevag/the_friend_zone_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/61409480358.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 4440 bytes
SHA-256: 6ae085109320f1b8f6ad8c1044719d846527e167635673636216900cf400a744
font_01_sfnt_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 11360 bytes
SHA-256: 6649106449946f057fa84e0932ecc2318321eaf54ec6a38da3e535baa9e82696
font_02_sfnt_off00011947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11947 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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