Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76c2c4c5c1e0eb7…

MALICIOUS

PDF

75.7 KB Created: 2021-03-24 22:16:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 82d1482c4d168c96777a3631dd18476c SHA-1: 15910d4e0143a0fa1a4077d4a8b7031f953fcd7c SHA-256: a76c2c4c5c1e0eb7d7c2461194ea257aadd9a0eb34eb86b534e2a792ade0de78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=2019+calendar+template+editable PDF link annotation
    • http://liwuzagesasa.22web.org/mozuworovigujadojawijokit.pdfIn PDF document text
    • http://nukicew.xyz/33728437564l1hsm.pdfIn PDF document text
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/xovemedogemuvojejovi.pdfIn PDF document text
    • https://cdn.sqhk.co/gopefovepagi/hgi89hi/mod_pizza_delivery_doordash.pdfIn PDF document text
    • https://xabizukilitexe.weebly.com/uploads/1/3/4/3/134335342/cd6ff8b37.pdfIn PDF document text
    • http://fexufivuxo.22web.org/56327753012.pdfIn PDF document text
    • http://dalexepegubidi.iblogger.org/73401820357.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/6jhlcGC/bojojexufazadenan.pdfIn PDF document text
    • http://lamiwefawiwa.iblogger.org/frigidaire_range_repair_manual.pdfIn PDF document text
    • https://gexuganogos.weebly.com/uploads/1/3/0/8/130813630/soragesaxedelutinixe.pdfIn PDF document text
    • http://interbankdigital.com/how_do_i_find_my_ups_shipping_account_numberbz3pg.pdfIn PDF document text
    • http://natfreshik.fun/how_long_to_keep_infant_insert_in_chicco_keyfit_30vksyh.pdfIn PDF document text
    • https://gusoretudofuriv.weebly.com/uploads/1/3/4/8/134885571/tuzuzuvugixiw_depagogosubol_todutiko_vozotuxasisuduj.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
    • https://s3.amazonaws.com/jusuberu/absa_mobile_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/36773953577.pdfIn PDF document text
    • http://gowejolu.rf.gd/10225145530.pdfIn PDF document text
    • http://gikuxedikejoba.epizy.com/59880996695.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/44499084770.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/find_sound_driver_for_my_pc.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_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 5248 bytes
SHA-256: 7d8a03a360ed2f368b6cda2deebb60902eb6f75528f402006464d7fd04909fd6
font_01_sfnt_off0000f0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 10164 bytes
SHA-256: 76d1821aeb2883388e82e61ee5fc1362135e28e79464550736eb6a2ed0606e35
font_02_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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