Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc94d6e1b241e6ec…

MALICIOUS

PDF

82.7 KB Created: 2021-03-01 13:40:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 75c9dcee182dfa0e8d92a00230ca2c95 SHA-1: 4a3f5946f6751eab9c60a197841ec9915380ce56 SHA-256: fc94d6e1b241e6ec7dc3dad81c1b4fb2493cfe2064464ea3ed38e21f37bbda63
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards a spearphishing attachment, where the user is tricked into visiting malicious sites. No scripts were extracted, but the overall pattern suggests the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=metroid+2+remake+walkthrough PDF link annotation
    • https://febefadu.weebly.com/uploads/1/3/1/4/131453100/5454510.pdfIn PDF document text
    • http://nubolutlion.xyz/subway_surf_apk_para_hilesi_oyun_indir_club1aq6o.pdfIn PDF document text
    • http://finansi-7.online/how_do_you_use_the_jitterbug_smartphonenfi83.pdfIn PDF document text
    • https://berebexamoleti.weebly.com/uploads/1/3/1/3/131384136/kenepijazetavafisa.pdfIn PDF document text
    • http://top-agent.ru/826284536964aw2y.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/9c81dacea5cf2e.pdfIn PDF document text
    • https://dinabowufijub.weebly.com/uploads/1/3/4/7/134751612/goxamupudigagi.pdfIn PDF document text
    • https://femezusuf.weebly.com/uploads/1/3/1/6/131606597/8051985.pdfIn PDF document text
    • http://pek-24.cc/nixirefozekekekokamefubuiij6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498983/normal_5fef37b91cbc9.pdfIn PDF document text
    • http://contentmedialiteracy.com/soxefugozobovupoteudim7.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/cieiijg/86874690718.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/67dc7ea59ac0a31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/28263953546.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 3536 bytes
SHA-256: 1676981254f4930f4741f3bc7b86a35bacab87d7718750555e7e63745b637a0b
font_01_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 5356 bytes
SHA-256: f8253ef14a6ec6839b1b3075e6bf76de47d6fd11680bfb8663b1765b8e0cfb71
font_02_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 12688 bytes
SHA-256: 6c5881b1a1971d2b8033a857e69bbcf71414b48bbe6adc8617f6d081591f5f8e
font_03_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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