Malicious PDF — malware analysis report

Static analysis result for SHA-256 34819e10ac32b609…

MALICIOUS

PDF

82.5 KB Created: 2021-03-16 01:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3e2f71c2800eaa7d33de2e00da3ce921 SHA-1: 9c2ac8afeaa3f101932c50f4ccc024b05d9d435c SHA-256: 34819e10ac32b60907c5a9d1318c3878b7f40f77bc2ea7280638ec39d935a55d
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://druttle.ru/award?keyword=best+java+books+for+beginners+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458132/normal_5ff6adec919fc.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/21861919683.pdfIn PDF document text
    • http://lazirawolewok.getenjoyment.net/452292383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465930/normal_601f731470531.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/miller_syncrowave_300_tig_welder_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jidifulake.epizy.com/application_letter_free.pdfIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_01b8192948f54dc686c2bf6233180a55.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_3d5b7404f0f6463bb0d0c7bb82394396.pdf?index=trueIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_c38f7e439c5142aa82e78e12946af2fc.pdf?index=trueIn PDF document text
    • http://vufavaxotajoba.epizy.com/tone_it_up_workouts_arms.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_eccdda838f144fb491e288acf3068514.pdf?index=trueIn PDF document text
    • http://bufetej.epizy.com/what_are_the_most_significant_qualities_of_byzantine_art.pdfIn PDF document text
    • http://tipixerokofor.epizy.com/latest_design_patterns_in_android.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_edc8885e3a6e41e39a4c697c34425c1c.pdf?index=trueIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_384c10d790964c88bdb48e06e77be5d0.pdf?index=trueIn PDF document text
    • http://misamoxatupepos.rf.gd/wezidejot.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_off000102e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 5564 bytes
SHA-256: d1de6a12cd6abcad73b7f8c83e17c51ab3d993374fbd040658b40e48f78d3171
font_01_sfnt_off000115f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F4 11492 bytes
SHA-256: 22bd54bc888979db729397b313fae05499fd5c7891cb5b47115f66d72afe2327

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