Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f152ade0c40e92…

MALICIOUS

PDF

91.3 KB Created: 2021-05-17 01:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30146075f1c7992813891479708493ca SHA-1: 998f1d3787a298e9cb980a72940166e54aecbe1d SHA-256: d9f152ade0c40e9221c13258139e653587a7d5e078a4fbb6ec7c8dcf784b5301
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://jottigo.ru/strik?utm_term=the+harlequin+heart+of+darkness+quotes PDF link annotation
    • https://jajufuwupu.weebly.com/uploads/1/3/1/1/131163717/kusixumolax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378386/normal_600ce868abdff.pdfIn PDF document text
    • http://fruitslope.online/599382521291e2pl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_605db8efcc26c.pdfIn PDF document text
    • http://monoga.space/choreographic_forms_of_dancej4flr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370275/normal_5ffc93802cfb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_60396cda8d06a.pdfIn PDF document text
    • http://chempion.coffee/what_is_project_zorgo_leader_namebg9mf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490376/normal_603a6bacf03f5.pdfIn PDF document text
    • https://somuwozav.weebly.com/uploads/1/3/4/5/134525430/1146838.pdfIn PDF document text
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/wujipimuzugi.pdfIn PDF document text
    • http://digtalcaliper09.xyz/how_to_hook_up_rca_soundbar_to_element_tv6munx.pdfIn PDF document text
    • https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/sogenoves_xekatajazabij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_601452a4c27a1.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/db12a479-fa43-4aa6-bbfc-ad64390d43af/79392194346.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_91d382c45dcd4cee9b3f07943e1608f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2de028-1834-4830-91ee-34fb1ba70e9d/what_are_the_principles_behind_the_12_steps_of_aa.pdfIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_4541e8b3df31413ab3692d3101c48dd7.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_4c11a7189e1e4f0ba7c2a5090f429b81.pdf?index=trueIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_617eb4d204e04eebb8eb6b1d78d23f9a.pdf?index=trueIn 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_off000127bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BB 5132 bytes
SHA-256: 2604cf3fdc6e19ff9f060a4bcba086165903abb3314e0959a3a5eb3d44fcda49
font_01_sfnt_off0001392c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 11496 bytes
SHA-256: 4a576dc7bd42ae5e8a70f6a4bc3d8ba1c7046ebfc3c89d5461e7b1139f5268ae

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