Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ccaace5b57838bf…

MALICIOUS

PDF

113.0 KB Created: 2021-02-13 03:12:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dfb35c575586454aef3b69289e04fcf8 SHA-1: 102faac035d959a05143fc51d3c97705bffbc2dd SHA-256: 0ccaace5b57838bfc734cd0c3a5e84a64cea71ccc20c9f5f0b8cb58c46ce79d9
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 0.9998

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://baarspo.ru/wix?keyword=band+of+brothers+synopsis+episode+1 PDF link annotation
    • http://kurs1.xyz/vurijobejiwipemesusaxat5bgjw.pdfIn PDF document text
    • http://radanukodufam.22web.org/transformers_alternators_ravage.pdfIn PDF document text
    • https://cdn.sqhk.co/befulirawid/ge8hhgd/heart_pronunciation_in_american_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_5ff4c44e7ef36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498978/normal_5fe357f41e30f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_5fd9bfa739072.pdfIn PDF document text
    • http://reduslimer.website/99335280894cu2f2.pdfIn PDF document text
    • https://cdn.sqhk.co/rutesawir/iahgjiF/27663777256.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/hhW8hjr/classic_slow_rock_love_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_60198a63a674b.pdfIn PDF document text
    • http://creamwalls.space/731075967771llac.pdfIn PDF document text
    • http://prizinsta.online/murodixekizuxiverekwmg8a.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/gc6Bhdl/narevusuvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kesazubajumat.rf.gd/69562521932.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/89547004416.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_off00017dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DFF 5440 bytes
SHA-256: 793905b5ea747c1aa82086fe0f442b23721de70793b401329148a7df565e7c15
font_01_sfnt_off00019081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19081 11440 bytes
SHA-256: 55a4d9403777b3331e59d917ce73ff0b27831b1e9b625170ca9230a054f29a52

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