Malicious PDF — malware analysis report

Static analysis result for SHA-256 a335c407345a5406…

MALICIOUS

PDF

73.1 KB Created: 2021-06-01 16:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9f40b19ab2f7e47d378af85e470d7f9b SHA-1: 13e763a2113a63041600bb6ce8fec66aa0517958 SHA-256: a335c407345a54062a539efa46cba9db18323a20208131bb2dd17fccfaa333ee
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm, containing numerous external URLs. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing sites, aiming to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://oniceh.ru/pbw?utm_term=what+does+it+mean+when+you+always+see+234 PDF link annotation
    • https://nanelovuw.weebly.com/uploads/1/3/5/3/135328611/4012962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388048/normal_6061aed95a251.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/semog_kutapediboros_roxesemus_pokemid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_600a052e781cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_6034008837a93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_60693e0ac6ebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_6010fc7f9c9db.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d042ff-2e86-44b4-86d4-1509101b2266/english_sentences_with_urdu_translation.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/how_do_u_play_10000_dice_game.pdfIn PDF document text
    • http://muxopal.pbworks.com/w/file/fetch/144440049/mlb_perfect_inning_2020_mod_apk_unlimited_money.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144436764/dremel_7700_battery_life.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f45c56-86d7-4d79-ae77-6fd54f69c93f/69474597565.pdfIn PDF document text
    • http://garifukedako.pbworks.com/f/how_to_get_android_imei_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bdca546-01ab-400d-9e56-b5816eafd652/cards_against_humanity_card_codes.pdfIn PDF document text
    • http://wekibivu.pbworks.com/f/turkey_meatloaf_recipe.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_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 5560 bytes
SHA-256: de4619af3627932877fd07827eb3272cd0471403f5c19377c0de760459277cba
font_01_sfnt_off0000f4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E1 10148 bytes
SHA-256: 13dcf2ba530a9a08dc761ac6b8837ddf0c3fad595e1b6d586396fb23dc6d3d90

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