Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b7c82799e7c5611…

MALICIOUS

PDF

81.9 KB Created: 2021-04-10 09:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3afaae46351e716921c5cdf3aa0c70f4 SHA-1: b041bef7caa264e801843cb5b9bc3bef3949ef16 SHA-256: 5b7c82799e7c5611bc12488d5c87d1805d80dc3f0ac91ed212b720256cd98de3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links pointing to various external domains, many of which are hosted on disposable or suspicious domains, suggesting a link farm or phishing operation. The document body, though partially obfuscated, contains a title related to organization structures, likely a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=what+are+the+various+types+of+organisation+structure PDF link annotation
    • https://cdn.sqhk.co/miloxuso/xqghbKs/64230322069.pdfIn PDF document text
    • http://marketitaly.info/critical_thinking_skills_to_put_on_resumem339i.pdfIn PDF document text
    • https://cdn.sqhk.co/kigowabalo/gvigdhd/guwaso.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/hZljehc/papajajenunagiwuwekiwuzet.pdfIn PDF document text
    • http://losqutoq.online/42932764612p82s7.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/sipewupanumolugotawelupzkio.pdfIn PDF document text
    • https://kekiwudegabute.weebly.com/uploads/1/3/0/8/130813612/131002.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/hitman_agent_47_game_for_android1jaqb.pdfIn PDF document text
    • http://fridgeservice.ru/923553002454waud.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/tm5jcgj/crowded_house_songs_something_so_strong.pdfIn PDF document text
    • https://cdn.sqhk.co/wefonasifaza/fse0U8Y/burger_shop_matawan_new_jersey.pdfIn PDF document text
    • https://rupilobeva.weebly.com/uploads/1/3/0/7/130775598/3964811.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/USLMQXE/munudirusubises.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/zezuzudef.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/hdI3ohc/oppa_doll_game_online.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/8e098e30-c932-41e8-8098-21928865f29f/70454683010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7fb4ed-3bf2-47bc-a155-a641bff7126c/software_testing_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d66cf1-d33f-419d-86a9-1635bf3c0373/dasulisuzaxejukegaredup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b37f1659-a751-435e-be02-47e97e841034/69629176904.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b4f774e-537a-4fc1-9fab-f03245e24f24/28899051006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17a5429a-6af1-4835-8f0a-d50005b2baea/27638951580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e53c0376-4b57-4ff9-ac31-871469b4a03c/53368263855.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_off00010191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10191 5420 bytes
SHA-256: ab83fa44eb5024c68faa59832c184ecd6a86f97214914be7f1e444d382576d62
font_01_sfnt_off0001141b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141B 11040 bytes
SHA-256: 6abe2a27559339fb4517ac9a78f90a1c77f8d494727a86d7de7b5e4775e8bdd1