Malicious PDF — malware analysis report

Static analysis result for SHA-256 f157ca05e5e766f1…

MALICIOUS

PDF

74.7 KB Created: 2021-01-05 08:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 28ef087e9a23298455d60a9e77b5f864 SHA-1: 9f65b756e227076d3574a321c754707418750188 SHA-256: f157ca05e5e766f190971249e9f52c9535dc0f4f6d3d87a31a86778b5b8c64b9
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links pointing to various websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious, consistent with ClamAV's detection of a phishing trojan.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=loose+meat+sandwich+recipe+with+brown+sugar In PDF document text
    • https://jarowezib.weebly.com/uploads/1/3/0/8/130813985/jixapixuvowamet_pikajidujivabi_sodijapiwef.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/luwizo_nomitizepas_jinetulukizupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_5fd78b5b24b56.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/iejdjfu/fifa_world_cup_2019_bracket_wiki.pdfIn PDF document text
    • https://fozunisomizu.weebly.com/uploads/1/3/4/6/134666093/50c45c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469849/normal_5fc3a85139b4c.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/lofulinuzit.pdfIn PDF document text
    • https://cdn.sqhk.co/papebikuwi/jazp2Ka/ivory_ella_surprise_box_august_2020.pdfIn PDF document text
    • https://tupekado.weebly.com/uploads/1/3/4/5/134514551/35641f8f.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/ijhfhiT/write_my_name_in_stylish_fonts_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/0KxNoV5/25499358894.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/tupofelasujewas/microsoft_outlook_email_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/brand_guide_book.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CE 5628 bytes
SHA-256: 56a98cd9e1d76b59553ce7128186a090e3c109953af5d712ddbc33429a495d1c
font_01_sfnt_off0000fad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD3 10332 bytes
SHA-256: e13d554bd0a5631d16e70e0641ddca6826e2441188b267c31043827693782cc6

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