Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ede64b4b6b78f7…

MALICIOUS

PDF

84.5 KB Created: 2021-09-22 20:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8d3761b19621e73ecc54e7a96314265d SHA-1: 3df18f80465a4ea8930c4ce2cbd956b95d0b4978 SHA-256: b8ede64b4b6b78f706e563c0d926ec4dace0650c4b0312b01bacf47e897df23c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to external, potentially malicious, sites. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://anm-av.de/uploads/files/lamisibiw.pdf In PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/88163012975.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/17508589843.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/betifoxuxag.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/59961983561.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/mosutovukorakolute.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/tumubolomuladirigikil.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/wexevuxowupe.pdfIn PDF document text
    • http://ahknchem.com/upload/files/72378052335.pdfIn PDF document text
    • https://mlspoland.co/files/file/wewanupoto.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/baverumeref.pdfIn PDF document text
    • http://zgic.ru/!upload/files/74879193983.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/14857053722.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021920310541580.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61354500A0400.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/19464903732.pdfIn PDF document text
    • http://artepcb.com/upload/files/90142226853.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/95660750978.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/66643867872.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021917222310.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/webusiludonuparoxipezufuf.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/bofalufulolosunawamidago.pdfIn PDF document text
    • http://vipdiler.ru/files/file/65222434707.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/19693491784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=easy+voice+recorder+iosPDF 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_off0000e73e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 10276 bytes
SHA-256: dc6491b7526049f8bf031c43bde8163e4737600a33b9f236eff6648e3bd4b532
font_02_sfnt_off0001169f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169F 17484 bytes
SHA-256: 34e10e3e6120e4927f4629f06e4bf43fddce47091dd3a1be671bcf7654180602

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