Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6141dc23627c7ef…

MALICIOUS

PDF

77.2 KB Created: 2021-03-19 19:03:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4087d225d60d065678c3b44f73865330 SHA-1: 770f528dff24d5ca843a91f681dee934522c9f91 SHA-256: f6141dc23627c7efff9f901a0c7b88d07189549169cdec70a21c8b4e18cad10c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 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.
  • 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://baarspo.ru/wix?keyword=pokemon+revolution+online+wiki PDF link annotation
    • https://cdn.sqhk.co/risenulowo/w6Z34hg/direct_democracy_definition_geography.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/bfH9GdF/zusevomikadefotesakanitu.pdfIn PDF document text
    • http://bojukekaj.66ghz.com/kujerizawemilikivux.pdfIn PDF document text
    • https://dizilezojo.weebly.com/uploads/1/3/4/2/134234798/morejimutenigoruv.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/jdzTDia/75127729929.pdfIn PDF document text
    • https://cdn.sqhk.co/nudogada/ahcjhid/fnaf_forgotten_memories_season_1.pdfIn PDF document text
    • http://murerejomijuv.22web.org/gijojimawivukudeziji.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/gonesijosatiti-dufituzidit-fupojemiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/MjaMibI/kupanufar.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/jogowiw-jofupuxiba-zateluzufiseruw-soxawajemuje.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383582/normal_601ab17193a0c.pdfIn PDF document text
    • http://vudujupuboneg.22web.org/fundamentals_of_plant_virology.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464523/normal_603f1384732f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_0d3e9db22b644e6a8afcc395665892bf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levovod/lawn_tennis_racket_buying_guide.pdfIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_20b8a0a9aea84e33a42087b5e1ad9d61.pdf?index=trueIn PDF document text
    • https://3ced707c-20bd-49bb-93f1-edb15be4e391.filesusr.com/ugd/e90305_fa7d00595563440bbca529be9430bec9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/turukibupigimilinaduk.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_3a696e9071254ed2b20e06b1ec150b4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemazun/codycross_answers_group_346.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/gavarenekujoxunumijej.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_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 4660 bytes
SHA-256: 83cb98fc07ba6c6fc28fc3fdaa1c2f5f64ae128852539ab6219f5c225e64d22b
font_01_sfnt_off00010106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10106 10920 bytes
SHA-256: 6df1aba225be0a2525d3f284ee41cf1781c7f2a352879183c0741fec24dabf73

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