Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a1bcb07ebbde7e…

MALICIOUS

PDF

75.2 KB Created: 2021-06-14 08:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: bd24af462aa9dc1ec647355c658b640f SHA-1: 0a7027b8e328625bb0436096733e29b7e9fa2182 SHA-256: 83a1bcb07ebbde7e1d36a299bac1645916640cdbe7f0690b2b20e8765fd2434d
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm intended to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://garglob.ru/pbw?utm_term=tac+geometric+design+guide PDF link annotation
    • https://bofeliwibetu.weebly.com/uploads/1/3/2/8/132814086/danagujoro.pdfIn PDF document text
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/606380.pdfIn PDF document text
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/wepikekotoxer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144775956/sejuririjomamejagufes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ec1d79-83ec-42be-aa4f-7ecb04c488a9/tatidobevotowoxutifutur.pdfIn PDF document text
    • http://pikalunik.pbworks.com/f/how_to_treat_herpes_zoster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d87eca-0c79-44fd-bfa5-fab671b7fe50/jemobinogeralolakuroje.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144915093/naruto_era_shinobi_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa90c642-ee5a-451c-8763-2be610aeba05/walmart_bradford_pharmacy_fax_number.pdfIn PDF document text
    • http://kizisoj.pbworks.com/f/how_to_run_android_apps_on_iphone_without_jailbreak.pdfIn PDF document text
    • http://pejuzor.pbworks.com/f/lagexitawaripidufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5aa7e47-acd8-4b1d-810e-2d7db01b8561/maryland_car_inspection_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9026660-b457-4f19-a010-4645868eb403/51020791976.pdfIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144448848/taboo_card_game_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a293aa55-b14a-4a62-8d58-2ce2ec490f84/sig_sauer_p365_holster_owb.pdfIn PDF document text
    • http://dowiginade.pbworks.com/f/vapuxami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90f656f-afbc-4c08-b2af-a5c2ed80c49d/wekefotaxugoniro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a953163-914b-4f8c-a2d5-f458270ac134/5990476072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ec9d0a-7399-4b7b-b38f-734ae4bc57c3/21714879608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7caf224f-0c78-45d9-8a42-018fe9a131a6/64934932926.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 5060 bytes
SHA-256: dbe3f9ca541cf73b2709a378c3370b1cb33b945ac8d3460338eeedd168239f1c
font_01_sfnt_off0000ed62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 11240 bytes
SHA-256: 05322a06767030d3d0e14fe6d6c04b92364962f4db6a0dd08c8f2433a4d64e73
font_02_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f