Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd4df381da1718f…

MALICIOUS

PDF

78.4 KB Created: 2021-02-12 04:10:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 86d9c6c19813f8873ac176ee57928617 SHA-1: 90faef67f6a7aed98d1286d46b5ce98e204cde09 SHA-256: cfd4df381da1718fee232d540214b186d9f771e778d04bce741598d20ca3df1c
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. One prominent URL, 'https://jottigo.ru/wix?keyword=runescape+rune+memories+quest+guide', is presented in the context of a game guide, likely to entice users to click.

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://jottigo.ru/wix?keyword=runescape+rune+memories+quest+guide PDF link annotation
    • https://cdn.sqhk.co/sovanoniwuva/fiijgji/biganakuzumowide.pdfIn PDF document text
    • http://idealica-official.website/lemon_pudding_angel_food_cake_dessert_recipemavte.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/CgfiiYp/tiny_home_builders_london_ontario.pdfIn PDF document text
    • https://cdn.sqhk.co/toruwapelot/ifha6jg/gowegijirikoro.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/ielSHy6/world_conqueror_1945_apk_download.pdfIn PDF document text
    • http://tazikuruwuwozu.22web.org/informant_movie_true_story.pdfIn PDF document text
    • http://studytogether.fun/lerodasiso2rgec.pdfIn PDF document text
    • https://cdn.sqhk.co/sebazisop/6jjTeej/remok.pdfIn PDF document text
    • http://tixshopclub.fun/kfw_baukindergeld_antragu2bb1.pdfIn PDF document text
    • http://arevakar-travel.com/faginovej6tqaw.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/AEqgije/70240140281.pdfIn PDF document text
    • http://arfeshome.com/167804720060wahq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389090/normal_5fcdcbaaceb91.pdfIn PDF document text
    • http://wordwild-store.com/69386632409wjcyc.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/82652237328wjzs0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufapawaxuta.rf.gd/eclipse_neon_3_linux.pdfIn PDF document text
    • http://rusuxagek.rf.gd/bingo_game_printable.pdfIn PDF document text
    • http://zasegusof.epizy.com/41980962819.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_off0000f708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF708 5492 bytes
SHA-256: 81469f40228736259ff8cb73950365769dc98434d0ace02a8883e1ab97bcb782
font_01_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 10244 bytes
SHA-256: ed7c36dc982b7c5ff043963daa40b0896b8ad3437e43f1bae2d2d976890c2020

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