Malicious PDF — malware analysis report

Static analysis result for SHA-256 daad651ee902860a…

MALICIOUS

PDF

64.5 KB Created: 2020-11-18 05:51:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cf10f1aece426672b1bd201a6f900933 SHA-1: 25ef8e755a5bce48ce9c4b0562ffcfddd2dc7de5 SHA-256: daad651ee902860a8ed37bf136f8446353165d3df97d2d228873b9df487601f3
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-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://trafficel.ru/123?utm_term=maytag+washer+repair+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f872305b3198.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/3401bcf869c3bf.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/1523784.pdfIn PDF document text
    • https://xibedawik.weebly.com/uploads/1/3/4/5/134584063/252062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5fa67ba9cfeff.pdfIn PDF document text
    • https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/98b3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_5fa8afa7583d2.pdfIn PDF document text
    • https://zosufolukariv.weebly.com/uploads/1/3/4/7/134755865/7367254.pdfIn PDF document text
    • https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/469fe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f9b40e3193bd.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/gipug_xuvuzipufiwipob_fafilu.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/wonoti/76420730826.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/murray_riding_mower_gas_tank_recall.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/word_whizzle_dragon_answers_wide.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_off0000c059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC059 5388 bytes
SHA-256: a0e5b65c1f63673dea0be2b4fc7eb3abd0fdba911e6dd37a695287aae546bc3b
font_01_sfnt_off0000d2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CC 10132 bytes
SHA-256: 9421ca483fab068190e55c08a38388bd1e557c9051b53ad1b43324822d768f76

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