Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f70474bfba42bf5…

MALICIOUS

PDF

75.9 KB Created: 2021-03-23 04:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 73fc0a994fbbcc0720b4ff8ae53c9d2a SHA-1: c3fdc99f57333cd12ed3ebcca3212056dcf4ae3c SHA-256: 0f70474bfba42bf55c91463926b6b705f5b1ca88e91e7b521834715e475c88f2
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://crophysi.ru/123?utm_term=how+to+format+sd+card+samsung+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454671/normal_6036be7d22cb4.pdfIn PDF document text
    • http://verifybadgehelp.com/63779984363bnjb5.pdfIn PDF document text
    • http://universityru.fun/17698785595dwdym.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/92713ad167ae5a.pdfIn PDF document text
    • http://card2card.live/achyutam_keshavam_lyrics_in_telugu9mu2x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498842/normal_6010a95b45a38.pdfIn PDF document text
    • http://optarfes.com/49143514649bbxli.pdfIn PDF document text
    • http://choosemadam.site/agile_project_management_system_meaning9y3u7.pdfIn PDF document text
    • http://hytri.com/what_did_charles_darwin_discoveredvnheq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5fc9ec04286d0.pdfIn PDF document text
    • http://megahit.space/power_of_positive_thinking_audiobook_youtubejth87.pdfIn PDF document text
    • https://lusizemanu.weebly.com/uploads/1/3/4/1/134108609/pizigobamujo.pdfIn PDF document text
    • http://siondez.ru/31462068986223tg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495399/normal_5fec907c4672b.pdfIn PDF document text
    • http://spoonnumberone.xyz/bikini_body_burn_12_week_guide1apgu.pdfIn PDF document text
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/ef05f.pdfIn PDF document text
    • http://snapchat-alert.com/dewopunofereb7teth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8fcf30-b085-4ec7-a2f7-60a9fc30bded/how_to_learn_algebra_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbedee2d-0672-48cb-9584-68c2277fd7fa/52946054281.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_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 5588 bytes
SHA-256: 42b4a4cb6552086bebc4e404e58ae4502820215eb0230692b5c402470012d618
font_01_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 10376 bytes
SHA-256: 119f0f760ee7044e09ab915135c21884b2cfcb81761511ec125e82047df4f1bc

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