Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3cd1f22f6f30bc1…

MALICIOUS

PDF

80.2 KB Created: 2021-03-05 12:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 669d8362163bb62d6af606fdcf80dab9 SHA-1: bb2a8dab57777b4a3d76cb1ac75f528b1401033c SHA-256: e3cd1f22f6f30bc1df99d76e7e9701a3ab85c6e6b00c90557701de6968e8e556
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, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The embedded URLs and the document's structure point towards an attempt to manipulate search engine rankings or trick users into visiting 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://kuzutuzo.ru/strik?utm_term=price+to+own+a+chick-fil-a+franchise PDF link annotation
    • https://kixarazebeda.weebly.com/uploads/1/3/0/7/130776474/2486310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fed496261dce.pdfIn PDF document text
    • https://lezigumaluneluw.weebly.com/uploads/1/3/1/4/131454696/8816826.pdfIn PDF document text
    • https://pajotesose.weebly.com/uploads/1/3/2/6/132681045/7be5e5162.pdfIn PDF document text
    • https://muvusawit.weebly.com/uploads/1/3/5/3/135392745/fejagodidobapomasi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447101/normal_600754412c2fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379387/normal_6027e346c8251.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/wobipiwim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_5fd39ac2d8e5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_600a28e1f3837.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/40196463525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_5fd7dbf65c701.pdfIn PDF document text
    • https://gixefizavemo.weebly.com/uploads/1/3/4/1/134108956/88a4c9a.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/nkjv_journal_the_word_bible_large_print_premium_leather_brown_red_letter_edition.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/raverof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_602775cea4232.pdfIn PDF document text
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/360dff54005b33.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://ba30dffa-51fe-4caa-9472-6f142403a9bb.filesusr.com/ugd/c2007e_2122d5900f264c61905dd2b260700e4e.pdf?index=trueIn PDF document text
    • https://7bfa0b14-7c42-4681-af51-c5eb670ddee5.filesusr.com/ugd/e54fc7_c4d2035597c947319bee1531317877b4.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_81032d696cd3444f831387c6ea1e03e9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 4948 bytes
SHA-256: eda98e883c7c74b30ed05113a99e99e6fd8481fdc3dd43ed766a7548ca581c26
font_01_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 10836 bytes
SHA-256: 58acc6141f7f9e15186192555f9c537b8a7404bab53696d1e5bade9e7fb942ee
font_02_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71