Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2c017448f34aa8…

MALICIOUS

PDF

72.4 KB Created: 2021-03-02 21:09:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a683ba03a2a9ab9c1beb96272a616ae5 SHA-1: 14dd1c755a39454906aadc09fe4f5998e25e3527 SHA-256: 1b2c017448f34aa8996eb9d9bdabda3c13069d7f353c9679e00c1db8453756dd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=how+to+use+sterilizer+avent PDF link annotation
    • https://cdn.sqhk.co/pomijatan/lieY0bH/bomumusebopigipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408475/normal_60346ceae9f20.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/NorjeZS/rivexovivenikarifito.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_5fd1f6184400f.pdfIn PDF document text
    • http://jiteruruw.sportsontheweb.net/34311475657.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5fe0f24b7788f.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/byRjdif/apps_like_burn_your_fat_with_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/isjchjb/39557537829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462351/normal_5fdbfcc97e257.pdfIn PDF document text
    • http://avlto.best/kogofanornabmx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464303/normal_5fe51cd8bb0bc.pdfIn PDF document text
    • http://idealslimitaly-official.site/74402671826gupka.pdfIn PDF document text
    • http://waystep.site/what_is_theory_coding_scheme0q6kf.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/4j0iahg/smashed_potatoes_with_crispy_onions.pdfIn PDF document text
    • http://form-copyrightservices.com/navy_seals_salary_per_monthr9dyl.pdfIn PDF document text
    • http://itchia.space/kuletumubulonapupuryexid.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/iMoWije/shooting_range_challenge_sniper_3d_hack.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 4840 bytes
SHA-256: 79c7a1d0199b8897a6b790b3f7bc65bf3176269b0cbb7b56d3da798ecacf383a
font_01_sfnt_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 10424 bytes
SHA-256: a923fb623cc20c90c97f926788d17ebc86085ccd407fadd5d2df54b7a2f66c77

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