Malicious PDF — malware analysis report

Static analysis result for SHA-256 44750a90bddb4405…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 01:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fe0e9ef1255c5a2ce13ec3e002aa3b75 SHA-1: 6ff733b30403957917f4ba45676015ee56ade7ef SHA-256: 44750a90bddb4405b3c6aa4f17221d457df738f40d288bca02fb94141577ab94
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of callback phishing or tech-support scams by prompting the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is part of a phishing campaign designed to trick users into contacting malicious actors. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://casaledellasignora.it/userfiles/files/tinubabom.pdf In PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/72322367276.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210911054814.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/25117624510.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/33909963727.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210912_28C1E764CF4C2E84.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/24161266973.pdfIn PDF document text
    • https://clinicscrm.com/img/files/69591610117.pdfIn PDF document text
    • https://j26clean.com/upload/files/94367280502.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/lotozereza.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/2125354654.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/nezubok.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210912_C9E8438A1E8E6130.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/jetivovedejedenewubunawul.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/dakudepafotepusuveb.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/85699798698.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/kimexazetidajuwa.pdfIn PDF document text
    • https://denimder.org/resimler/files/tanike.pdfIn PDF document text
    • https://wasael.com/userfiles/file/nemozivosariwonewita.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/80046878378.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/22120621990.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/tuxezetulo.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/35215361711.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b629c03391---93545515447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+do+you+backup+an+sd+cardPDF 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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 16900 bytes
SHA-256: b11020749432f528f6f607a9efe9f6f8007a62e602f330b97eb6f5c44b363938
font_01_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 10664 bytes
SHA-256: 48f4cb7328e36f017f96b67141cc4b104c083323f208923ef43925e50ae5898e