Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d02a7fcd86007fb…

MALICIOUS

PDF

84.4 KB Created: 2021-04-23 03:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c9968b6edf17396a28144cc60ea65d98 SHA-1: 527a2c7f3d281f17d41fd40f44b4b00a9fd28a21 SHA-256: 8d02a7fcd86007fbfb9b6f7d403087c66cd4869aa1c43daf61757ab1ca706335
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 presence of numerous embedded URLs suggest a link farm designed to redirect users to potentially malicious sites. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=seated+theraband+exercises+for+legs+pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=seated+theraband+exercises+for+legs+pdf PDF link annotation
    • http://mkuu.club/37523996111u3zm6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_605d7134ba2d4.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/a6jgPid/76272002719.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/jigjWZE/tatajoki.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimole/aZhbGhe/44408630400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_604d8899931fc.pdfIn PDF document text
    • https://cdn.sqhk.co/forexajepusa/WS2oiao/wumanametoz.pdfIn PDF document text
    • http://xuritepizib.mygamesonline.org/publicidad_coca_cola.pdfIn PDF document text
    • http://myfirstsite.xyz/fuxetuxoat3.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/pafitevet/hi5egeN/appa_movie_video.pdfIn PDF document text
    • http://biomaniks.website/xeruteei6rg.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/asus_dsl-ac68u_vpn_server_setup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485308/normal_5fc608b449aae.pdfIn PDF document text
    • http://bonifacy.site/96227467193bjlbp.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://tediguku.atwebpages.com/amelia_bedelia_first_day_of_school_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad274003-ee45-47ad-b2ab-a45e1a682ae6/rasonulodalebabidaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fcdb800-34de-4827-a992-04856326f664/how_to_get_verizon_hotspot_for_free.pdfIn PDF document text
    • http://rozibililev.epizy.com/how_do_i_reset_my_nec_phone_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f37fb1-9105-495b-963a-4f1576a3c616/burger_king_french_fries_nutrition_facts.pdfIn PDF document text
    • http://fazegixedibuw.rf.gd/vivitar_bluetooth_wireless_speaker.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_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 5516 bytes
SHA-256: 0869e0cd7595955ce20d2ffc8f5b5673684d286e9ef4ce0e06bdc368742d8be8
font_01_sfnt_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 10640 bytes
SHA-256: a9d7e3538ae2b9a6d60d877933c6eec73b6f5c9213c286a9c7c6cc3bc382152e
font_02_sfnt_off00013635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13635 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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