Malicious PDF — malware analysis report

Static analysis result for SHA-256 945662160931ea28…

MALICIOUS

PDF

75.4 KB Created: 2021-02-28 02:30:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fcad97b1893e2fdd2e19f96623224536 SHA-1: 20fe58e9e0bed6150927cd2b2e7b3288db5004b1 SHA-256: 945662160931ea282c0468a51f7d0f67240197f0bb719c634e615450b2701505
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains a large number of external URIs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or SEO spam campaign.

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://bologen.ru/strik?utm_term=d%2526d+forgotten+realms+novels PDF link annotation
    • https://cdn.sqhk.co/verexoleki/ijp8thj/bowidemukuwuna.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/d0iovn8/ahly_vs_zamalek_history.pdfIn PDF document text
    • http://mattelipsticks.site/how_to_set_resmed_s9_humidifierb4o7o.pdfIn PDF document text
    • https://gofuzuxelizexo.weebly.com/uploads/1/3/5/3/135391542/9599862.pdfIn PDF document text
    • https://cdn.sqhk.co/manigonodapu/Tq7iijf/bible_stories_for_preschoolers.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/YdDakpm/fill_in_screw_holes_in_wall.pdfIn PDF document text
    • https://kimubewej.weebly.com/uploads/1/3/5/3/135329621/9911533.pdfIn PDF document text
    • https://xuzuvakewose.weebly.com/uploads/1/3/1/6/131637797/a251964aafb29.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/2f92994a0afa.pdfIn PDF document text
    • http://makamar.xyz/gre_math_subject_test_practicerk4ae.pdfIn PDF document text
    • http://vaxisezawoged.scienceontheweb.net/how_to_heat_up_leftover_alfredo.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/fososoxiworixawudefisffcdh.pdfIn PDF document text
    • https://wubudebekezame.weebly.com/uploads/1/3/0/7/130740051/jopala.pdfIn PDF document text
    • https://kevosenebiv.weebly.com/uploads/1/3/1/8/131871602/vinamamonumora-ketafirulo-kusokunowevo-lipewu.pdfIn PDF document text
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/vokamam.pdfIn PDF document text
    • http://politach.com/theory_u_otto_scharmer_bookchyfy.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/3737880091.pdfIn PDF document text
    • https://puzapageduz.weebly.com/uploads/1/3/1/4/131453954/sexufu.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
    • 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_off0000e296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE296 3484 bytes
SHA-256: 865832ca46ee1aac596e2af09c34c3d6059d9ba0f9f4eea226865a594599e1c6
font_01_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 10804 bytes
SHA-256: 5e71325a1000f6a839d3bb818da59349ca6aaff49befcf7c1240de356db671b3
font_02_sfnt_off00011308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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