Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3405db6f3d20a9…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 21:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 236d6d0fee0c294c4e70a97cb3e6ea61 SHA-1: 8b1c0982dffc26479ecb560517a81a8e0b822347 SHA-256: 1b3405db6f3d20a9d7242652656e6d4fd8d639fab7db18da782696382683a271
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan threat. The heuristic 'SE_CALLBACK_LURE' strongly suggests a callback phishing or tech-support scam, where the document prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://huntic.ru/uplcv?utm_term=little+snitch+android PDF link annotation
    • http://trips-in.com/ckupload/files/37861726632.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210912_60D004679DC31CD5.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/18206262529.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/67565657543.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090900585873499.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210903122840.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/31523487958.pdfIn PDF document text
    • http://arucax.am/user_images/file/14788159701.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/31238794036.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/95887376857.pdfIn PDF document text
    • http://orenprom.com/img/account/file/bigedifikevirod.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142f89b7ac0f---nuvataxulekewuv.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/kinegotun.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/jiporeletudokidaxoj.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/detitupatarolipe.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/23838067166.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/xovopegada.pdfIn PDF document text
    • http://tipiland.net/upload/file/wozugululorirowixiposuvon.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/pumelimisalikusebipap.pdfIn PDF document text
    • http://letdentalab.com/img/files/nedavela.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4789c1cc9---19329604222.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/86240955834.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/wibebuzasarokifu.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/49949930495.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/dujefevogunigigomur.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30A 16884 bytes
SHA-256: 1da18abeaee9bb1f7903262e8432927b91e1e0227673bf6bbb4ea92758da1b2f
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A5 10424 bytes
SHA-256: 2ede82d93295f69f443209d95fa398a891ee40f9a0629c9195771cdeac5c59f2