Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1df95865a5b5aa…

MALICIOUS

PDF

92.7 KB Created: 2021-03-19 06:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e51635d7e66377cd2e99639610a9ceac SHA-1: 531c011d58f82c4c0ace9f73878288cbd9c6ab70 SHA-256: 5e1df95865a5b5aaf4cedfb54d32707a34897a4d943c81657e31cae35c4e7eaf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered via spearphishing, that redirects users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jacksth.ru/wix?keyword=las+formulas+de+seno+coseno+y+tangente PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415530/normal_601a997e27b32.pdfIn PDF document text
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/detejop599n.pdfIn PDF document text
    • http://fenofojerafama.22web.org/lamuwopap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485929/normal_6047b218eaad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_60485d74b5957.pdfIn PDF document text
    • http://brumbum6.xyz/503960789312ebip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vapekepufarifo.rf.gd/bruce_schneier_practical_cryptography.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_e324c61e18004bedbe0ae769cb1ee8af.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_16588daafd0e454b9f43df8f04b83357.pdf?index=trueIn PDF document text
    • https://d572dbd6-ec42-402e-884a-3db6daac2318.filesusr.com/ugd/6a558d_6865127d3b1848b086b959a004ba56a5.pdf?index=trueIn PDF document text
    • https://b2bd4247-5771-4f9a-9f3f-b46500bff287.filesusr.com/ugd/f41bfe_f46b69c82a074c59bbc43749ba61113f.pdf?index=trueIn PDF document text
    • https://4ec63ec4-77bf-4499-900e-7c522af20654.filesusr.com/ugd/35bdb9_09a9530af5fb4149949ed4319831b550.pdf?index=trueIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_2cd264f04e5f44b284aeb03eac946193.pdf?index=trueIn PDF document text
    • http://wijopimitiraze.epizy.com/19313612484.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_f7dc5e6815ef4fd6a6a037cef804a1f0.pdf?index=trueIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_1485d1c9d78c49479e01153057ab97a7.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_9dd513462d5d48cead7f5f981341038c.pdf?index=trueIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_5e8cb1ea966840ea86d1daadd1005ed5.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_1ed46a530cf2435ca4cd8352044efbf7.pdf?index=trueIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_c519140094e948cb87f84595efba33d8.pdf?index=trueIn PDF document text
    • https://764dfaed-7091-4b1c-a8ff-ceb5b694923f.filesusr.com/ugd/4bafdb_25f688fdd01a451fbada2b959e701dbf.pdf?index=trueIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_f4c2e4c3e892405c84d0d70d46a01573.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 5220 bytes
SHA-256: a3d3940bb03fdaff98683d0d749dbab471fd3c152fe1c748e9a15b2369a7d542
font_01_sfnt_off000114b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B7 13900 bytes
SHA-256: 1bfe3257fe886921776082ec3a07ad4c497694ca35337e07443f17c5eac9cf68
font_02_sfnt_off00013f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F69 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00015499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15499 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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