Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75adf7b1ecefd23…

MALICIOUS

PDF

75.6 KB Created: 2021-10-01 14:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9f246fee0e62ac214d1370488b7e9577 SHA-1: 22225bce6f510844e49119032bab1e8a154521d9 SHA-256: b75adf7b1ecefd23ff451fb520b66603df5f990e3f369099a1f51ac0e3926db7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, with one heuristically flagged as a random, algorithmically-generated link. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a number, consistent with phishing or scam tactics. While no scripts were directly extracted, the presence of numerous external links and the ML classifier's high confidence indicate a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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://pistant.ru/uplcv?utm_term=tom+and+jerry+game+2020 PDF link annotation
    • http://toyotarent.hk/FileData/ckfinder/files/20210903_4B745318D31F2382.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109241700069282.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/nonadafilizujukej.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/33340335108.pdfIn PDF document text
    • https://dafelia.com/files/86947752830.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/59324346227.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/30503886313.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/watagekop.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/buxubapegukivemabed.pdfIn PDF document text
    • http://osayit.com/images/file/85133254785.pdfIn PDF document text
    • http://cutskytools.com/d/files/70452075068.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/34585023187.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109090301149703.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146238d20f61---43936362312.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/mavowugozodunawepaxab.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/17392001233.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/tejofolus.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/70438212866.pdfIn PDF document text
    • https://ibericadearmerias.com/file/49759633607.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/35286041830.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/fevekabetuvorapar.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/50240770763.pdfIn PDF document text
    • https://thehouseproduction.net/file/mulolokamo.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/71117300236.pdfIn PDF document text
    • http://fohow77.ru/upload/file/58068376289.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/jexawubetetaxapexokakukuv.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_off0000bf72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 10636 bytes
SHA-256: 01dc2efd723856dcef1af470fd01e066f9885c9e0ab9b0dadad0ce7138192590
font_02_sfnt_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 18988 bytes
SHA-256: 5bb461e719b5d87c58db4927b50797300a1a173fc02b899aeca81b791d70770b

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