Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ca8b1d5729a7d1…

MALICIOUS

PDF

81.1 KB Created: 2021-03-29 15:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5560e14cbd48f30e786c17766a5fbeda SHA-1: d43ade95ef9964b3079c016a4670080aa0731bbc SHA-256: 76ca8b1d5729a7d18a3266a23a0d004d7e742b1484f3be4e82046e7740353d0d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, and one specifically identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to downloading free software, which is a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=como+descargar+movie+maker+para+windows+10+gratis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_60561c36dd051.pdfIn PDF document text
    • http://xakojudanek.66ghz.com/13472579753.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_5fc69f1bbcfb6.pdfIn PDF document text
    • http://free-at.pro/what_is_the_teaching_excellence_framework0jzqk.pdfIn PDF document text
    • https://ribelogexarov.weebly.com/uploads/1/3/4/5/134500322/854540.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/zebimezupogodazr4ub5.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/litula.pdfIn PDF document text
    • https://badobokitevobux.weebly.com/uploads/1/3/0/9/130969603/5633036.pdfIn PDF document text
    • http://com-servers.online/59130936466rkfh7.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/6826083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369917/normal_601eaee624293.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/netisiregofuneboxet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459628/normal_603faac27a2bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_6012ea20bb950.pdfIn PDF document text
    • http://ek-arenda.ru/cyber_security_vs_information_securityapo5u.pdfIn PDF document text
    • https://buxijabis.weebly.com/uploads/1/3/5/3/135329720/pubuzuwebawe.pdfIn PDF document text
    • http://stopro.store/child_psychologist_evaluation_near_mea3xk8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_9753ec9069bc467ea261171fbd2fa9c4.pdf?index=trueIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_24650a3bc3104012bedf45be4ec19a0f.pdf?index=trueIn PDF document text
    • https://db6a684c-bd73-4a61-997a-17040cc1d896.filesusr.com/ugd/bbbb20_cc79700becda4d1ca7a0207fe2e9185f.pdf?index=trueIn PDF document text
    • http://sawopigemon.epizy.com/car_crash_investigation_report.pdfIn PDF document text
    • http://ladorum.epizy.com/88401103074.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_7c3599925615495bafe9dfda6f0c7a01.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 5676 bytes
SHA-256: 21f8667e9f06cbef7bd00c298acc97120592b22eb9a957cec1f6cc1369b1fe8c
font_01_sfnt_off0000fa41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA41 11436 bytes
SHA-256: cd0d8bb8c32f7f3ea44c1ee650dd30f4090514cbd8308f82ad24ebde5cf1bfb8
font_02_sfnt_off00011fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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