Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6865b6e62c8ab0…

MALICIOUS

PDF

82.5 KB Created: 2021-03-03 23:00:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0b95ae5d5c15a3bdf78b99b25e77311f SHA-1: c8c03c77dcc6f441ed000ab4e6a46f41c5c5a3de SHA-256: ce6865b6e62c8ab0c7c859f0139a30b8c358661e59f524d72372ee3fc3bbbee8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains a large number of external URIs, many of which point to disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of numerous external links indicates an attempt to redirect the user to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/123?utm_term=white+fang+1991+cast PDF link annotation
    • http://xapepinozex.22web.org/calcium_oxalate_formation_reaction.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/nikon_d40x_battery_stuck.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuluxaja/b67Pxia/skyblock_seeds_for_minecraft_ps3.pdfIn PDF document text
    • http://doordash.fun/44649264668trzj.pdfIn PDF document text
    • http://teragoronowaki.iblogger.org/south_movie_full_hd_song.pdfIn PDF document text
    • http://blockhcain.host/fogumitobeguwiijgyb.pdfIn PDF document text
    • http://bazis-rostov.com/holmes_tower_fan_htf3409ar_manualt6m9j.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/nivizavinawifodurupura.pdfIn PDF document text
    • http://findattime.com/samsung_galaxy_grand_prime_plus_price_in_bangladesh_202078phg.pdfIn PDF document text
    • http://jakijofuvi.iblogger.org/19507391504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ritoma/74897159098.pdfIn PDF document text
    • http://sasaxunofob.atwebpages.com/dell_inspiron_3847_motherboard_front_panel_connectors.pdfIn PDF document text
    • http://xenemusexo.epizy.com/46035381126.pdfIn PDF document text
    • http://gusozafameximi.epizy.com/gefowoxa.pdfIn PDF document text
    • http://rijimilaje.rf.gd/xuminuvud.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 5236 bytes
SHA-256: 9f06dc34e42197f76543e665a7017bdc6123d8459a64e65306c535d233926f60
font_01_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 10932 bytes
SHA-256: ac8e4ba4e2e48b56b7daac3aadfe0cf9f6b591e5efb371ed0c412d945ed82e53

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