Malicious PDF — malware analysis report

Static analysis result for SHA-256 9995a96c8e79572d…

MALICIOUS

PDF

76.6 KB Created: 2021-04-04 10:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59246e9c81bad55e647e813e58561f12 SHA-1: b61d6ce21f25f42f2b547c9ede34aac8031e7814 SHA-256: 9995a96c8e79572d78c8e8bf4ac0e6281a1336675621dfaa7366d9d8db93d2bd
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is https://mezovuduw.ru/wix?keyword=bola+tangkas+gratis+berhadiah, which is likely used to distribute further malicious content or phish for user credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://mezovuduw.ru/wix?keyword=bola+tangkas+gratis+berhadiah
    • https://bapizemu.weebly.com/uploads/1/3/1/1/131163962/vibobiz.pdf
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/varulokaxopodeb-rekori.pdf
    • https://cdn.sqhk.co/kivutuzo/dJhdElA/mifejibuwazep.pdf
    • https://kefavemi.weebly.com/uploads/1/3/4/0/134042724/9c86a124.pdf
    • https://cdn.sqhk.co/sivumazudi/ijf30hi/xiveditimigevozuj.pdf
    • https://cdn.sqhk.co/nomelafu/UFvMibH/idle_ants_game.pdf
    • https://cdn.sqhk.co/xafeperale/jhc0iaG/off_road_outlaw_4x4_monster_truck_games.pdf
    • https://cdn.sqhk.co/wejafivelij/cifhdic/hearthstone_top_decks_2020_feb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tujeviwakirawu/purchase_requisition_form_sample.pdf
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_61f01859be73402cbe44665d0cbe33c8.pdf?index=true
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_cf027119d7a7441f8dd16eae5d5d01be.pdf?index=true
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_35dde750a6dc4ba98f3becd53c62f77c.pdf?index=true
    • https://s3.amazonaws.com/vigevot/xiwujepoloxaruroji.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/23024568864.pdf
    • https://s3.amazonaws.com/kudowo/jaluwokeguwu.pdf
    • https://s3.amazonaws.com/zategafozasiru/87032832837.pdf
    • https://s3.amazonaws.com/mefonevimimix/formal_letter_template_blank.pdf
    • https://s3.amazonaws.com/tabobujimo/kijejuraku.pdf
    • https://s3.amazonaws.com/fadedosi/nozirupebivegenusap.pdf
    • http://kaxozofevaz.epizy.com/how_to_change_frequency_on_sennheiser_ew100_g3.pdf
    • http://pakekaririwofas.rf.gd/54579180647.pdf
    • https://s3.amazonaws.com/degisapemifa/begolomisowuvekip.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebbc.bin
df859737e7b5f5dec003bd820dc9e9cbdbc55fd185c6dd9179f07841165073b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 5340 bytes
font_01_sfnt_off0000fdde.bin
f095e9c9ce8907cbc606aad626eec5b1d98400fe982c72920bb65c8a4c4ad856		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 11040 bytes

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