Malicious PDF — malware analysis report

Static analysis result for SHA-256 d527823bac3d450d…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 02:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 29832898b39aae3abc3b455db43939fb SHA-1: 5fedf77603e693f1774f9496344f70b7b161e1ca SHA-256: d527823bac3d450dc57dcc93a1ff48cd43564423c08bf692888bd6b6ac68cca5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files, suggesting a phishing or SEO poisoning campaign. The presence of multiple distinct hosts and the use of UTM parameters in one URL further support this. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://zanethompson.com/userfiles/file/47028888083.pdf In PDF document text
    • http://giadinhmedia.com/uploads/files/68735510460.pdfIn PDF document text
    • http://ciskmv.com/css/file/sazozoxisufotababamupe.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/61195063195.pdfIn PDF document text
    • http://zerosquareonline.com/file/wumasewuvarolo.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/69947644884.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/ridob.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/sarokus.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/romedinalivoniwexozixe.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/misikamedafiluw.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/76551545740.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/97969556754.pdfIn PDF document text
    • https://anup.bo/images/files/61660695539.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/vipanonunudadotegixusobi.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210906041714.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/lazanugeriv.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/74023290300.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/79195029980.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/pusez.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/38274910549.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/79o5gcvhemmunpq8t4fnt2ll10/naxiwotedupirumivopek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=running+out+of+space+on+android+phonePDF 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_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 17620 bytes
SHA-256: 80076ca4038b9e110e492214f5bb29eebc55623ad4fe0d335e824b530b05a055
font_01_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CF 11000 bytes
SHA-256: 0f0e872ff53828a45db14e0f6408a9ba8a8ea1d9ee0066ea42eb4c5d9a972fc7

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