Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c118ccf13f95e8…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 04:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dcefe256619d9270e485c8523d49fbe0 SHA-1: 36dcfe6970d74b6f2aaa4c173464029911305827 SHA-256: 80c118ccf13f95e87dc4807f214b0ccaaa6f96825033100c3395de404eeb4e1a
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to external files or link farms, indicating a potential phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links, likely for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hycxchina.com/filespath/files/20210903150644.pdf In PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/wuzegajujixoden.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/35761156567.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090201213655.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/58728160.pdfIn PDF document text
    • http://texmet.pl/userimages/file/navid.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/kezalikatefutim.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/fujogaxe.pdfIn PDF document text
    • https://losungversorger.com/product/file/gurifaxawugegagop.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/73174860763.pdfIn PDF document text
    • http://chpcentre.com/files/file/babugetefasiridasili.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/feninavudizuruko.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/b312a95ea4e43d6255db54ec995df88b/32709270641.pdfIn PDF document text
    • https://unosms.us/userfiles/file/94420778131.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/ratuvazuvogivebuwitagatur.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/gusudituwuvujanemikanesu.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/zazuletetedivodusenagobe.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/lugif.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/motogademirumun.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/54629703186.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/92939395277.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/vomizapesinisudiwobo.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/26291001269.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/24965309320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sims+freeplay+lifestyle+points+cheat+2021PDF 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_off0000d131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD131 18436 bytes
SHA-256: 281628b3a6f576c731679087b6c585c58dc52603b833fe5836c089a0a9240654
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CF 11228 bytes
SHA-256: e48571ee60b81268dd9bec61de7be3f66e660fee6ef9e1910f078fd1b507646d

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