Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f9d0391eb0ef27…

MALICIOUS

PDF

81.6 KB Created: 2021-03-09 11:28:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0c4badba557749edfa90f9574b53ef4e SHA-1: de3bd9e52cd5c3c306e6d348d2052f5b6232d2f6 SHA-256: 27f9d0391eb0ef27f6b0d2cd8fa04f1a338bb1ef9fc098d65af196f7e91b747b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It impersonates the UPS brand and uses a visual download button to trick users into clicking a link hosted on 'dugedepap.ru'. The presence of external URIs and a link farm heuristic further supports the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://dugedepap.ru/123?utm_term=android+adb+usb+driver+free.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/123?utm_term=android+adb+usb+driver+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369920/normal_600df28e5ef89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_6010f3185b0cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5fc9b21d3a289.pdfIn PDF document text
    • http://clientesdkb.com/shoei_neotec_2_splicer_tc-5_helmetqtp6p.pdfIn PDF document text
    • http://creditscorerepair.info/89335668100sq8yx.pdfIn PDF document text
    • http://changely.club/jamikabagexanibijoseno6x9r8.pdfIn PDF document text
    • http://gtmedis.com/how_to_write_a_qms_manualw9r0p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_6032208eb6a43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368500/normal_5fcbaa53b6dee.pdfIn PDF document text
    • http://profaudit32.ru/logitech_pure_fi_anywhere_2_user_guidetqduf.pdfIn PDF document text
    • http://gakmancreatures.ru/pokemon_hidden_power_calculatorcj9wy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fe060dca3c7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490265/normal_600835929385d.pdfIn PDF document text
    • http://lbaranaydin.com/noon_shopping_ksafnyv4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mukutud/64413688664.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/tufoxazusuxafeledefutedum.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/60377130401.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10269 5056 bytes
SHA-256: b6172c1a1790b56b242ccc8c17ff57a52dd33a44c525deb307276c5a39e9d25e
font_01_sfnt_off000113af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AF 11376 bytes
SHA-256: fabea030dccc3b6cf4676f30601b8623694c38e982156412b3eee75313ca842e

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