Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc7f95e90a7370d…

MALICIOUS

PDF

63.2 KB Created: 2021-02-18 14:49:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 85ee421a26717d95ddf0bb736d822178 SHA-1: 01f71d6c515fa187d4cf90a0f06f62fb0b349314 SHA-256: acc7f95e90a7370dae6031fe658898988a0d835964c603e8cc205ddc583db0bd
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://crophysi.ru/123?utm_term=simplicius+commentary+on+aristotle%2527s+physics+pdf PDF link annotation
    • https://cdn.sqhk.co/jokawefezo/hamC1hb/69402724258.pdfIn PDF document text
    • http://vashastrahovka24.ru/pmbok_guide_5th_edition_freed5m2r.pdfIn PDF document text
    • http://jinitevuwug.iblogger.org/spanish_crossword_puzzle_worksheets_answers.pdfIn PDF document text
    • http://devlp.design/baxolewhprw.pdfIn PDF document text
    • http://pegiwikepideke.iblogger.org/xolobaz.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/jegibjc/kanto_power_collection_box_msrp.pdfIn PDF document text
    • http://lifeeuro.info/xurenuvekibeme77bm.pdfIn PDF document text
    • https://cdn.sqhk.co/guwaloxipete/3hdihm8/naxavobemabigavosejusoxez.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/djihhG3/sushant_singh_rajput_ringtone_instrumental.pdfIn PDF document text
    • http://tuvuvadirozo.iblogger.org/losukovegedaxisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jexusigek.rf.gd/hyperlink_function_google_sheets.pdfIn PDF document text
    • http://bilunet.rf.gd/vuziratud.pdfIn PDF document text
    • http://volegurez.rf.gd/musixonunamebijig.pdfIn PDF document text
    • http://nemowuroniru.epizy.com/chimera_tool_full_cracked_free.pdfIn PDF document text
    • http://lobivovakebala.epizy.com/37135878152.pdfIn PDF document text
    • http://xuwomotibinifen.rf.gd/glencoe_mcgraw_hill_illinois_geometry_answers.pdfIn PDF document text
    • http://wufijuwodep.epizy.com/kabomegaziwob.pdfIn PDF document text
    • http://feliruxitekul.epizy.com/4184227946.pdfIn PDF document text
    • http://wamunezufim.rf.gd/andy_android_emulator_wiki.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_off0000b9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9DE 5636 bytes
SHA-256: 9e894fab90d1759cf38d5ed4f6bbe1ae840c196118f1e2657b3a613277549eef
font_01_sfnt_off0000ccec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEC 10016 bytes
SHA-256: ab9c3f7c4694d2d98fbab9ca4b0cddd76b796e94a59f5a13d7fcaac882ea0e03