Malicious PDF — malware analysis report

Static analysis result for SHA-256 353f838bf2cd8719…

MALICIOUS

PDF

70.4 KB Created: 2021-03-20 04:26:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: cc7b4097c31897e38666cc263f5b7747 SHA-1: 4bcdebbbd3b5450addde98e0cab69c0d10dc6509 SHA-256: 353f838bf2cd871939c7ebeb1db92fd16ecdede2cdeb5ae03c7bcc8ddd3f9132
186 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/award?keyword=devi+aarti+sangrah+in+marathi+pdf PDF link annotation
    • http://xijivedijimidip.mygamesonline.org/92937286803.pdfIn PDF document text
    • http://bukuxojunuz.mypressonline.com/29860069356.pdfIn PDF document text
    • http://pubofumoxo.scienceontheweb.net/lozipimititerofubopuvuja.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/26e809cc-b14c-421f-ac4c-89b0992431ca/vadanerujageremezuvadi.pdfIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_eee09c9479f947e0b91d6098215cd329.pdf?index=trueIn PDF document text
    • https://db7841a4-af10-4990-a2be-f084cd4acbf6.filesusr.com/ugd/e3c460_13a80ab7327d4f7f96a2750a040eea61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b92bc8-99d0-4013-bb61-eb43e32202a3/yaesu_ft450d_for_sale.pdfIn PDF document text
    • http://xedawobu.atwebpages.com/packliste_backpacking_thailand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c63c2b-038b-4b59-b917-0732caeeb418/pairs_function_in_r.pdfIn PDF document text
    • http://fepusum.onlinewebshop.net/where_can_i_donate_unwanted_toys_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24bab684-75fb-47f7-863f-07f61be56c72/80614876020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a3ee1e7-556f-47d3-b6d5-b7e65b545349/a_dolls_house_characters.pdfIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a1501be432374d37b34912c520aa6fb2.pdf?index=trueIn PDF document text
    • http://wudemexa.myartsonline.com/how_to_use_ge_convection_oven_probe.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_daa428bf25b84da2a3c94f2332b57a7f.pdf?index=trueIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_cc7d6f0cf84a4e5fa07850876b353d03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/afec56af-5ff2-4927-874e-1c05494d4907/77283685261.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/cerebro_creativo_y_ludico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56cc7ee-3c75-46df-b356-3fdc7ad2cc87/tokagorofegidor.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_a8e7bb01982a45489022154a618da94e.pdf?index=trueIn PDF document text
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_bfc68f8ec70b4356af95136f799c397d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 5484 bytes
SHA-256: 3c4878084ac75c303ce9371adcd9a4b3da06c41915c89b9ce0c0d17a27a5d301
font_01_sfnt_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 10812 bytes
SHA-256: 1ebae2e603de62661e27dbcddb408594c7e1674713d38ea67a2f9eafe81d31f1