Malicious PDF — malware analysis report

Static analysis result for SHA-256 db1970fc82189cf5…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 04:50:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b33edab9218e3ff7cf91d44713fc7b37 SHA-1: 1340e5013f9f4c1a73093534aafb2e461d14f8fd SHA-256: db1970fc82189cf5074cbca4ed7d71c6551d6e8d0f5925338ef27c81d9d18dbd
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it contains a link farm with numerous external URLs, including one pointing to 'xezojetit.ru', suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the link farm heuristic strongly suggest the file's purpose is to redirect users to potentially harmful sites.

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
  • 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://xezojetit.ru/123?utm_term=capybara+poltergeist++file PDF link annotation
    • https://cdn.sqhk.co/pivokazi/gdhcngj/dragon_quest_7_ps1_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_6008d693ed3ec.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/hahihb3/20105343539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379038/normal_5ff15dff76e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_60461c75ee2a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_60192ede906c3.pdfIn PDF document text
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/7523773.pdfIn PDF document text
    • https://votadewigul.weebly.com/uploads/1/3/0/7/130775387/gekemok-pefanal-riluwu-faxoraji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_600aadcf78fe0.pdfIn PDF document text
    • https://befinutu.weebly.com/uploads/1/3/5/9/135971501/11edc3e9b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_60375d4e5e3b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_6020734ae94ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_5fff3aeccab33.pdfIn PDF document text
    • https://cdn.sqhk.co/jilebodetifa/m4hjnhj/xukeredufogezabu.pdfIn PDF document text
    • https://paxogusav.weebly.com/uploads/1/3/4/0/134040839/a1d9f.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/ijlha0q/idle_highway_apk_mod.pdfIn PDF document text
    • https://vajilitoseg.weebly.com/uploads/1/3/1/4/131437648/savodatidonono.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/a4458d4b-f361-4a85-a9a7-7e7c0012ff83/19146909310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94434ce6-8ef5-420f-bd4f-367f0326e78d/64001827385.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_ca8c9aa5a5e241f080ff69212248d92c.pdf?index=trueIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_727e241376504a1d887e16a5ef6be9cd.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_de19d788d11946b2ad501124019b4301.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_24a55c7553444c7db269f6fbaac82539.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec553e9-e057-422b-ab0b-c226c76161d5/how_much_do_software_engineers_make_in_dubai.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_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 5216 bytes
SHA-256: 21991b7eced6a70175bba63abf9ad9110f072b50a4338a2043e424fdae22c2ed
font_01_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 11864 bytes
SHA-256: d08a0967c9d1bed0cae79e61b3ec020745cc49dfa356c723118dfc1a0abd0f4d

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