Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8f0a8b95f41dcf…

MALICIOUS

PDF

73.3 KB Created: 2021-03-26 11:29:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 96a2138f680ccfdcaccc984a399cbe5a SHA-1: b9123bb34a3be3a56e74164a1a775eb380882a1c SHA-256: 1b8f0a8b95f41dcf960dc9bfbd56dd4673935871efcc7a8e6035fc3d62f57160
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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
  • 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.
  • 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://gimoguvi.ru/award?keyword=numeros+romanos+1+al+1000+pdf PDF link annotation
    • https://xobojurum.weebly.com/uploads/1/3/4/5/134599739/6551822.pdfIn PDF document text
    • http://wojurimaxab.mywebcommunity.org/14331168266.pdfIn PDF document text
    • http://sberin.xyz/agent_orange_vietnam_wartcadq.pdfIn PDF document text
    • https://pixizibonemitu.weebly.com/uploads/1/3/1/3/131382366/sawek.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/hhcx1ih/new_tik_tok_videos_telugu_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/jggejfA/dream_island_acnh.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/princeton_review_mcat_course.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/hhjafMa/naval_war_movies_on_netflix.pdfIn PDF document text
    • http://extraevents.ru/how_to_turn_on_lights_on_hyperx_keyboard6aswd.pdfIn PDF document text
    • https://lomizagufefeg.weebly.com/uploads/1/3/4/0/134096038/8ff8c6c.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/d171c5a6-5a21-43aa-a4f7-9561f1d6f111/power_pressure_cooker_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe95b6a5-854c-45b6-8ac9-698782ae620a/what_to_study_for_cdl_permit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13273a4e-917c-412d-a556-0f5016447144/zawak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/460f0115-0d82-4475-b972-2cda6966e69f/margin_of_safety_seth_klarman_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ebbf4c-6f9c-4945-94c9-6a89466bca91/zufuniletefuxelajisepegiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f767fe22-f39e-4176-8c05-0c6260ec26f7/how_to_store_combustible_materials.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_off0000de80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE80 5352 bytes
SHA-256: 44d997c2d124687b6cea860f35dbadf2124d178efb8b9fcf3dc70c15da82dd47
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 12044 bytes
SHA-256: e29fdb573128571de98f5d4fdad5f77076d1aa269c03284baf432685b97a5b05

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