Malicious PDF — malware analysis report

Static analysis result for SHA-256 055497448ccc5a33…

MALICIOUS

PDF

80.7 KB Created: 2021-10-09 01:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a317f64169c361be5429f74311adb01d SHA-1: d20bdf278d14082938a3ae3908cd6b670bdd7a0c SHA-256: 055497448ccc5a332012d3a694c5d9b3e9ff1cb7897e79e804c3b48470ac6a63
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan. The presence of many distinct, potentially malicious URLs suggests an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://partnercable.hu/files/56500172235.pdf In PDF document text
    • http://www.vinoplaza.nl/img/upload/files/12456912835.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/ffc4d6ca536f8e2f05f8f702d17c1200/litutiwejepokanenusanapo.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/zetawu.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/mijido.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/naropezegu.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/dunuzagisokixatudifev.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/kajase.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/juzonofotulepesegeduvejid.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/73470719514.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/47371209946.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-10/2109101254200263815krjw6eor5mw.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/50580052132.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/rotedazenima.pdfIn PDF document text
    • https://chineseclothingonline.com/File/budav.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/24883194995.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/mupesarewaluvejajafetov.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/47cfc479d1e9c0af84780b4f2befe780/ruwomuzasozodigaxuzax.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/56643113461.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/dilebedosamumavovewa.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/nenibopotobolozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=when+is+a+function+even+odd+or+neitherPDF 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_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 18992 bytes
SHA-256: df25c83d985eb866420ce5662d566d65f142b9d898bfc1e31625196fe88b1e11
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 10684 bytes
SHA-256: cf5a5e05ad7c1d6f6cfdeea6a887faf10ba9369e395a48c8f4f6477e5b0a60b8

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