Malicious PDF — malware analysis report

Static analysis result for SHA-256 561abc470fe5f1de…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 15:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a782a82214e396bdcdadef9804e0f222 SHA-1: d5d255d54956bb1e96f0ed05edba3506b6b87521 SHA-256: 561abc470fe5f1dedc9029ca159430187c606b8e6df3a1bc1340ebb8b2dc34ae
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. It contains numerous external URIs pointing to disposable hosting, suggesting a link farm designed to redirect users. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to trick users into initiating a phone call, likely for a scam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=galaxy+j4+android+10 PDF link annotation
    • https://seas2010.cienciaevida.pt/site/upload/file/fozovuxovis.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/dawupoj.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/vazojij.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/67388483595.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/wewowufixukovajefiji.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/55623773635.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/75434463646.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/48291819752.pdfIn PDF document text
    • https://limadelimon.com/images/file/dirijufitup.pdfIn PDF document text
    • http://lj-group.cn/upload/files/ragalugusegeweje.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/77865442638.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/baxizi.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/13089104896.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/96366307754.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/gelodut.pdfIn PDF document text
    • http://ccadl.com/files/20210902082740.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/fawuvafevewot.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/wuzuzigovikuvu.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/pesavemirudotupapazolu.pdfIn PDF document text
    • http://kelsenator.com/userimages/gagudawomi.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/wilobunifasotovoj.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/68228702743.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/leduvamep.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_off0000ccc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC9 10480 bytes
SHA-256: a2f6a244afe74a03866e8fb72779a7105d52817fc7ea4c72f66bc6ab323f728a
font_01_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 18096 bytes
SHA-256: efc382fca67000d35eefd8384f80fc20080e1e9261b909baf8f16842ec567e3c
font_02_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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