Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b491ea6e9735d5…

MALICIOUS

PDF

82.3 KB Created: 2021-03-22 20:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 51be2d1c4ea025c08ef232ee06aa57c9 SHA-1: 9d7cca2c56965592ed710a7ff88c6d5b5ca8d7b3 SHA-256: b2b491ea6e9735d5ba5dd4f47d8bbc35741a8423c42b82115c65f48fec962ea3
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The embedded content, though heavily obfuscated, likely serves to direct users to these external URLs, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/123?utm_term=bandook+chalegi+song+video+mein PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375531/normal_60327e8838af2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_604065bb27d36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454162/normal_6053ae88733eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_6015d2ea1fb0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_6052777a6b564.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473616/normal_5fdede677f63c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_604ca0c28a734.pdfIn PDF document text
    • https://zutiwemozebej.weebly.com/uploads/1/3/2/7/132712207/pufekiwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_60288104c8a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_6048efd26c1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369487/normal_5fdb6c38a075f.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/libam.pdfIn PDF document text
    • https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/subul-lukoxid.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
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_21909c01f7044758a6d07fce645a8c2c.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_20c608bd71714874be8f359b3a7b5c5f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/33bd6335-108f-482d-9c59-50f852350c38/cmo_se_hace_el_arroz_con_leche_colombiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e91782d4-91db-4456-b72a-d96d56235adb/22134442880.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b70ac5a-2a27-43d8-a7e2-ff5138fe3c28/78500374924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fbd4ca4-9b07-4e36-9a5b-cf942d29f2e6/98933078097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9376d363-a0c8-44cf-857c-60c0a255e889/23937373734.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 5136 bytes
SHA-256: 87c322734d35fb8e253500418217377587c115153c81a155a7f403ef9ef8510f
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 11836 bytes
SHA-256: fe7d25e2be1ab60c8cbed4396917e13e988b4cf63c996ae93122d0c22bdb2f79
font_02_sfnt_off00012d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D63 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176