Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf60fe603ab9b76c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-21 14:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26c693b6cfc79e2003e1f6ffa2f96dab SHA-1: 6294b01dbdb60d09a0fe1b8faff042c78dded079 SHA-256: bf60fe603ab9b76c1964201702e02dcbeeb90c0b9fd6bd79fc8de97839971479
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or tech-support scam. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, a common social engineering tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure suggest it may be used to deliver a secondary payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://marathonroller.com/userfiles/files/ziwiwosetatujusisitafof.pdf In PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/39256685205.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/82487810363.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/97u02hr0lqcrlu09d51ltk2qq7/sobatoxagusow.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/22264283233.pdfIn PDF document text
    • http://hasyo.net/files/file/fafibudiza.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/mopinawanibenikipuj.pdfIn PDF document text
    • https://ags-car.com/upload/files/durukusizufe.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/8157956383.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/saxurepaveferenanurefe.pdfIn PDF document text
    • http://home-plast.ru/foto/files/39372984417.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/rifexu.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vigolizoxokisemapigedonus.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/vujijodusunomuvaxorogifaz.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/81942603348.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631569984.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/lujadawosifomopip.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/22886824256.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/37900483018.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/durufe.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/19661443800.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161451e5aaf2f3---gigazodemowupisageraf.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/vajuzozolamudogekodazon.pdfIn PDF document text
    • https://telenovella-bg.com/files/xuboganifijajafoxoriju.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/85208825028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=learn+english+grammar+in+marathi+language+pdfPDF link annotation
    • 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_off0000b3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D3 16284 bytes
SHA-256: ab7058af9529b8725b0eb802a2c9174b25cf6a28aac00a8e1d98b5dcb3b00b7c
font_01_sfnt_off0000dd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 10884 bytes
SHA-256: 257f03cce1c73445860eedd6321266612d0cd77c9d6b7743de84c0380d5ce6d0

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