Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bc58f0cf8b4e24…

MALICIOUS

PDF

86.8 KB Created: 2021-03-20 05:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ac2e47eff8fc83974da7d7e11ae6ecc1 SHA-1: 10ea64b16bfdae764263e8345e4162c8dcc14713 SHA-256: 83bc58f0cf8b4e245048db89abcde7a48d8eb7ee085c4efbb4b366e3f5e0a6a4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://dugedepap.ru/123?utm_term=android+recyclerview+onclicklistener', is a primary indicator of the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=android+recyclerview+onclicklistener PDF link annotation
    • http://palumurawisan.22web.org/58989585934.pdfIn PDF document text
    • http://gayerkan.com/the_gentleman_s_guide_to_getting_lucky46joc.pdfIn PDF document text
    • http://winoorama.fun/how_to_convert_garageband_file_to_mp3_iphoneopuyy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kolenexe.epizy.com/22005567210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762d3f05-d76d-49ce-be9e-7120479fce19/block_puzzle_high_score_screenshot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6de0622-d499-43c8-b2ab-2c29d2357e86/html_css_jobs_for_freshers_in_karachi.pdfIn PDF document text
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_7a954e1bf04248888a10164de0e31dde.pdf?index=trueIn PDF document text
    • http://lurivukilurufex.epizy.com/duxakepugibap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a6ce93-ac9e-4db2-b1e7-c3c89661e6c2/how_much_sodium_in_taco_bell_hard_shell_taco.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_bb1dab56eea145c6bb573fdcac885ef9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/470ad832-8e61-455a-81a9-a15c09dbd0c9/can_you_sue_your_spouse_for_emotional_distress_in_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b17abb2-dad9-4623-a4fd-0063312723e0/hunter_douglas_powerrise_remote_control_2_channel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ea5153-853a-44a0-8301-472e2d6e9fb8/reinforced_concrete_design.pdfIn PDF document text
    • http://fojiguxojed.epizy.com/94782149668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824a08d1-12a3-4bbe-9e72-1651049f622c/great_dane_pitbull_mix_puppies_for_sale.pdfIn PDF document text
    • http://lodanije.epizy.com/hmrc_business_income_manual_use_of_home.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_off000112b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B6 5028 bytes
SHA-256: ae92c7dfcbff66c75c86a6e7247d885e89bcb7b81e485a4abdbec8b85514d31a
font_01_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 12092 bytes
SHA-256: 158a0f3932da5ff8258fe7500c3a2a7f4ef63162d513665de96b624ececc7616

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