Malicious PDF — malware analysis report

Static analysis result for SHA-256 f29c1a02f08bb58a…

MALICIOUS

PDF

72.7 KB Created: 2021-05-16 02:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f4c94c259b259bcc3fe957c79491ff3 SHA-1: b2bf789932994948bf3f76e63c5169b78f908dd2 SHA-256: f29c1a02f08bb58aed2cb69d3a52e8c011e718e3bb90e6dec3b9bcd161ac48ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains a large number of external links, many of which point to SEO-optimized PDF gateways, suggesting a link farm designed to distribute malware or phish for credentials. The embedded URLs likely serve as the initial point of contact for a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=delphi+xm+radio%252Fcd%252Fmp3%252Fam%252Ffm+audio+system
    • http://dimakuvojekoko.iblogger.org/61058976315.pdf
    • https://static.s123-cdn-static.com/uploads/4385038/normal_60010da12ea3f.pdf
    • https://rezomiwutamanap.weebly.com/uploads/1/3/4/3/134362688/femures_fixokewu_zalojemanazifi_kexawura.pdf
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/xerezal_tazutenujunavi_senekopuwuzor.pdf
    • https://fofonamid.weebly.com/uploads/1/3/4/8/134869219/suxurov.pdf
    • https://ferovagadimi.weebly.com/uploads/1/3/2/6/132696304/kepikozotojojad.pdf
    • https://gesunewa.weebly.com/uploads/1/3/1/4/131438127/reronanibuxabe_wokoramaxafawud.pdf
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/wumumet.pdf
    • https://cdn-cms.f-static.net/uploads/4389104/normal_603172781c17d.pdf
    • http://setovewurepenu.22web.org/wafofo.pdf
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/temegimebagi-rofumipatiku-ganokosolawo.pdf
    • http://ponarolo.22web.org/weludenoxejam.pdf
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/fixobuzodil.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_1fa182010dd444f191d3fbdc9f8826e8.pdf?index=true
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_77b3ebdc75ae43528e562e6f6303f9cc.pdf?index=true
    • https://61736296-a7da-4228-a4f2-5a582bd9a3aa.filesusr.com/ugd/1c12ee_bfe5e187e64a453884ebdccdbbca5273.pdf?index=true
    • http://xesoxudonututad.rf.gd/wusunezugagiwak.pdf
    • http://lorabedujeweb.epizy.com/85372111157.pdf
    • http://somutirawil.epizy.com/74053140073.pdf
    • http://mizujem.epizy.com/vopugusibamedekuxorawuga.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daca.bin
b3d10b81daa648f59057a99000b987776e93a58f6f6ce167577d09844aaaa0ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 5764 bytes
font_01_sfnt_off0000ee5d.bin
23cb1682c5d4b901026b80780c60a77e8d571cd1be413159cac40814791f9a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5D 11292 bytes

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