Malicious PDF — malware analysis report

Static analysis result for SHA-256 91364b951a945cc2…

MALICIOUS

PDF

65.8 KB Created: 2021-03-12 07:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 09b4acd2b3fd1b8d2359247b108f8c94 SHA-1: b6d6d85307202525d1e69abbd2faa51ec8cd5460 SHA-256: 91364b951a945cc2cc7830ab8ef3a19f495571beb9316ffd35eabce13968f528
226 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or scam attempt, as indicated by the ML classifier and ClamAV detection. The presence of a fake CAPTCHA heuristic suggests an attempt to deceive the user into performing an action, likely to lead them to malicious external URLs. The document contains a large number of external links, many hosted on disposable domains, which is indicative of a link farm used for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://golowaki.ru/award?keyword=addis+ababa+city+road+authority+pdf PDF link annotation
    • http://lilozekakotelup.sportsontheweb.net/53853176362.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/kabun.pdfIn PDF document text
    • https://wasexakenisopi.weebly.com/uploads/1/3/5/9/135982815/2048021.pdfIn PDF document text
    • https://zokemubolito.weebly.com/uploads/1/3/4/8/134895641/b980f3aba9.pdfIn PDF document text
    • https://lodotimafigu.weebly.com/uploads/1/3/5/9/135981467/eda1a1.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/misaxatanizaxenunabi.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/28456669410.pdfIn PDF document text
    • https://cdn.sqhk.co/bofimekowadu/g5jfEva/android_bottom_sheet_set_peek_height.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/hihieqe/stick_fight_the_game_nintendo_switch_price.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/PF2idSq/e_news_cast_changes.pdfIn PDF document text
    • https://dovinaturaxamij.weebly.com/uploads/1/3/5/3/135349119/8925929.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/pejotabexezirexafezola.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/fjdyz5T/sdsgc_tier_list_fr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://89511c73-251b-4bee-a1a5-5f4bd4863124.filesusr.com/ugd/f24cb8_890db65c94f64ef2ae1f9ed5a5bef4db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/gimp_2.10_help_download.pdfIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_b43f4600d368468ea8e2d9b4e2dc33ab.pdf?index=trueIn PDF document text
    • https://ed8bc375-cd54-49ab-9ddb-988cb5b2fc3d.filesusr.com/ugd/3f3824_af1fc7838b3e4f668867c2c64f3e5f7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/kozaliterozasepekuwevulum.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/45496439591.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_off0000c609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC609 5444 bytes
SHA-256: 14c09af98085f0bd10f743f1e1e4787baa3bc4b20b89df524ae2b6906bf6cae0
font_01_sfnt_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 9808 bytes
SHA-256: 3b4669414fdc5dcaea977c24c65723ead578f8404255784c35f12d6aad824c87

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