Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92ba29fe5ef05a8…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 17:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fca0290ede9870e57cd1ea891eb61048 SHA-1: 23aa30a5220aa8d44c7f7363f0978fe5150a2cc6 SHA-256: b92ba29fe5ef05a86e3133d16e7b39eb5e0cac04a0af9dd25751be5c2402036c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate structure for distributing links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=jcheater+san+andreas+apk PDF link annotation
    • http://tks-forever.com/upload/2021/09/20/file/84541766665.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/81837646892.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/pijil.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/60416474642.pdfIn PDF document text
    • https://parkettworld.com/upload/files/rumafo.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/todiwowomulenikenikiv.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/vawufipekumabuzuwukegu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a4a43c0bbff6753c5dfdac3956381521/27303653867.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf573d64c---7291405538.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210910163123768833.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/78453263576.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/wadukorefizawubinibero.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/8213831567.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rerogazimuw.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/52936944535.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/malena.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/28546865620.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/34293161405.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/kubolefokof.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/womizapuba.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/tiwunotenutev.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/torividiwenidifivugawenuj.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_off0000b211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB211 19064 bytes
SHA-256: ff46162e30851514cd9d8e34289036db0200add9f634eb63f4411b9a60644e68
font_01_sfnt_off0000e37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37F 10436 bytes
SHA-256: 9c8f598168855e50f0a7477ece70894102e87262a771788cd3c31a83a209d534
font_02_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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