Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03feaa1f00a6918…

MALICIOUS

PDF

78.4 KB Created: 2021-04-11 03:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d4f41e7d8605331c339613b260b6a53 SHA-1: 257a564677c45a4bccb2b6b8c95270415471ab48 SHA-256: e03feaa1f00a691842dc4aa654119cc1a8f4bd924a0c877cddbddff392185d89
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous extracted URLs suggest the document functions as a link farm, directing users to potentially malicious or phishing sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://kuzutuzo.ru/strik?utm_term=girl+with+the+dragon+tattoo+film+2
    • http://civiliscmq.online/fundamental_analysis_for_dummies1iioi.pdf
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/tuvobenovelus.pdf
    • https://betedodokadez.weebly.com/uploads/1/3/4/8/134882186/potakip.pdf
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/974674.pdf
    • http://vvvvvvvvvvvvvvvvvvvvvb.xyz/nozavovamalododejui9okl.pdf
    • https://muwefojiginilu.weebly.com/uploads/1/3/4/5/134512592/menol_vuxiv.pdf
    • https://tilipigenetuwa.weebly.com/uploads/1/3/4/7/134770736/lokekixabili.pdf
    • http://fasafumataluxu.iblogger.org/advanced_trauma_life_support_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1afc1911-3b81-4abd-a7d6-4fc380318773/saturated_solution_definition_chemistry_example.pdf
    • https://uploads.strikinglycdn.com/files/43cde123-4421-4ed3-9cef-7781bd06e997/did_the_mayans_invent_soccer.pdf
    • https://uploads.strikinglycdn.com/files/136afa4f-ba20-4aeb-b7ab-f80f0a518786/what_are_the_different_types_of_figurative_language_and_what_do_they_mean.pdf
    • http://talidarufuji.epizy.com/tisasorulexarivazizuwojer.pdf
    • https://uploads.strikinglycdn.com/files/7206c1a6-5c33-44f1-a63d-a64b52dffd3d/decision_tree_algorithm_pseudocode.pdf
    • https://uploads.strikinglycdn.com/files/9b689e4d-178f-4217-9f33-7e4481fbda65/kimberle_crenshaw_mapping_the_margins_quotes.pdf
    • https://s3.amazonaws.com/fopalew/18016260047.pdf
    • https://s3.amazonaws.com/bisiku/angular_formcontrol_select_required.pdf
    • https://uploads.strikinglycdn.com/files/e80648db-d97e-46e3-bb1b-58c222810473/hp_envy_4500_ink_levels.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f178.bin
d191135dc907a295044461f2b88b07aff6607f39acb42f297d280013a0f39236		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF178 5400 bytes
font_01_sfnt_off000103bf.bin
6ee0288854437662f9e855682dda070805faadeeb4819bf5211841c3c9fabe89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 12204 bytes

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