Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd67c9885bcc024…

MALICIOUS

PDF

76.3 KB Created: 2021-02-23 04:59:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03ff41b2bd0f5245dd94d20f684f9dc5 SHA-1: f4515aca276cd852b82f88e25bd7c62d407ff5ef SHA-256: 8cd67c9885bcc024aec54c3cb3dab641ebde3112a0401c97f4b74e693b2187cd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm or SEO spam operation. The presence of embedded URLs and the overall structure suggest it is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://jacksth.ru/strik?utm_term=donkey+on+the+road+again+meme
    • https://mumunemifuber.weebly.com/uploads/1/3/1/4/131406104/fejagigug-rofeviparoxa-sidogev.pdf
    • http://ch-data-2a8fv9s.pw/20146058534hrkfp.pdf
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/706ca84.pdf
    • http://natgood.space/48257190309rywqy.pdf
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/samev.pdf
    • http://mugedly.xyz/61388105522rf8rs.pdf
    • https://cdn.sqhk.co/fagisuxupinu/RjiCfjc/munsell_plant_tissue_color_chart.pdf
    • http://aslixan.com/el_vampiro_de_la_colonia_roma_descargar1hx2o.pdf
    • https://cdn.sqhk.co/xekutenupi/7khaUgd/95395676880.pdf
    • https://cdn.sqhk.co/detaludolef/iigoklQ/76963638865.pdf
    • https://reponobokuwe.weebly.com/uploads/1/3/5/4/135401207/7e37d0a015e7.pdf
    • http://cmb-accueil.com/eager_beaver_chainsaw_wont_start6fmsg.pdf
    • http://skidki-day.shop/best_american_ninja_warrior_runskhq0l.pdf
    • https://bosowumajozidu.weebly.com/uploads/1/3/0/7/130740465/f8d15e392e3ed6.pdf
    • http://getcreditreport.info/thetford_toilet_spare_parts_near_meli2yt.pdf
    • http://lojasamericanasbr.com/zuposoxqtlit.pdf
    • http://vumagiwupesaka.22web.org/lining_badminton_racquet_guide.pdf
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/b347eb4c783b420.pdf
    • https://mejatuwunuzawe.weebly.com/uploads/1/3/0/7/130775850/8685569.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dakekamuma.rf.gd/43406003431.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e091.bin
02be64018c80231847d787114303b59f519f6e700b391c1c43d09a041c6dff60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE091 4984 bytes
font_01_sfnt_off0000f160.bin
a9269aeddd52a667ef24578414cb2263fb2b27ffea00c43467e443c922ba2045		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 10732 bytes
font_02_sfnt_off000115f1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115F1 4324 bytes

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