Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9f57b6d6c7cc58…

MALICIOUS

PDF

79.8 KB Created: 2021-03-14 15:26:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: dd242f41d12e9f6e13e2f9331ecd99d0 SHA-1: e92c75fc96b069a7ac32f0ce0f50aec673938cfc SHA-256: ad9f57b6d6c7cc587d1f12d62deee58a6f3a5e39b3dc9d5564b658d025311912
146 Risk Score

Malware Insights

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

The sample is a PDF document that impersonates a customs declaration form to lure users. It contains multiple external URIs, with a primary focus on 'https://pelibifir.ru/123?utm_term=uk+customs+declaration+form+cn22'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the document structure and embedded links suggest exploitation of PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pelibifir.ru/123?utm_term=uk+customs+declaration+form+cn22 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368500/normal_6036db316c41d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5feec4be54470.pdfIn PDF document text
    • http://mastera-saydinga.ru/49261177184vjqux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459319/normal_5fe447e78bc1c.pdfIn PDF document text
    • http://7evenrp.ru/rollio_roll_rush_catch_up_speed_ballsvdhag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369764/normal_604a419dcf101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420230/normal_5ffa7cbc24bec.pdfIn PDF document text
    • http://wegolurubakisud.22web.org/dagata.pdfIn PDF document text
    • http://masalev.ru/gusodavudoxiip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380536/normal_5ff8291fa030e.pdfIn PDF document text
    • http://gonzo-3d.com/zobepozubagotelomanuboxajrxv8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451225/normal_5fe208e1f1f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459922/normal_60412c1336e18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_6000b77d638c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473903/normal_5fd62b248b9cc.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/dutuzanob/11142884007.pdfIn PDF document text
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_fd262a25ae3d44f69611fdab1a673fae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/badupamerolonijonuzog.pdfIn PDF document text
    • http://josisuvo.epizy.com/69564800262.pdfIn PDF document text
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_7d36de79f3ec42bb8857b994d0a12c38.pdf?index=trueIn PDF document text
    • http://bopofevuv.rf.gd/24689476676.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/mibinogoputivogut.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/adobe_illustrator_tutorials_cs6.pdfIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_76eff9fa16e04c61a8675d905e94158a.pdf?index=trueIn PDF document text
    • http://voxotili.epizy.com/94548433120.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_42a5408824c9420da4cc9e45cb94f39f.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_545bf5062fdb42e6b032df3de39446d9.pdf?index=trueIn 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_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 5356 bytes
SHA-256: bacaaafe304e5217b3ca6a057609e1bdd395a4927e96bc7e0a92f2594dc75034
font_01_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 11504 bytes
SHA-256: 13a997978f60eac0578c4e675c2ed0830e255a4217ddb0f48ca2d7caf096355a

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