Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4affff6c706cff…

MALICIOUS

PDF

76.6 KB Created: 2021-09-17 08:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50cc110b773abf34fb02b9da61a27e16 SHA-1: 8a7a9174d967848691b0caa936249d2f268b88ea SHA-256: 6b4affff6c706cff3c6e8224aad7bcea1ac5d45f78d195c9963a89f162c9ed81
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

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://philabc.ru/uplcv?utm_term=auto+message+premium+apk PDF link annotation
    • http://limobebe.com/userfiles/files/visifuwijimawi.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/36562368542.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j5moe9j839f6sq1abuvkualpt3/pofazifozofagefemapotis.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/75571716559.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/zewukumu.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/21287482725.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/modimegijevevoximugo.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/82290825057.pdfIn PDF document text
    • https://brukspec.pl/upload/file/rudupuwolibojo.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/binobaraxud.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/57632042596.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/begutikatumudoganafu.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lugemowabej.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/zovamavelonulakinarobanog.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/36416190550.pdfIn PDF document text
    • http://builderall.info/userfiles/file/51226472108.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/xabilepebisun.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/nowuxaranijadaso.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/16107588868.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/sipesakaru.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gomudilexurezimufebexat.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/mumubanexaxa.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/89126400225.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/51798374327.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/savabodozovametinijun.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_off0000c87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08C 17088 bytes
SHA-256: 2acc266869fbdaf45c0b2cc791272964185aeb947e1ad0f3a76c047031cb26b8
font_02_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 10616 bytes
SHA-256: 29b5fe4d0d2ff2d1782ac8c7fb528e6838b220c47a8e57a5855b4c04d1f3a592