Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a66d86f6fd1ca1…

MALICIOUS

PDF

65.9 KB Created: 2021-03-20 14:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c98f4c01b85d88806b2a737d5fa3674 SHA-1: 5e069e7e86019335e45bb8a65cf556d79e751bd4 SHA-256: e7a66d86f6fd1ca127813ffac38dacba927be9167040035c8795435090973929
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded external links, with one prominent link pointing to 'midufefew.ru', suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' further supports the attack pattern of using the document to drive traffic to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=shadez+3+the+moon+miners+unblocked
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/vulejotorefenara.pdf
    • http://alfa-quest.ru/portrait_mode_photography_definitionbtjbg.pdf
    • https://popofexepazor.weebly.com/uploads/1/3/2/6/132680818/nefajipasenopoloxir.pdf
    • http://online-bestshop.xyz/21978996225d8qt3.pdf
    • http://bestsaleshopin.xyz/xejagepesatixajexirwey7q.pdf
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/d1fbceddf8e4a6a.pdf
    • https://cdn.sqhk.co/noxisoture/sgeicgf/divizokewaz.pdf
    • https://xuboxale.weebly.com/uploads/1/3/1/4/131452808/wizaradatur-modudid.pdf
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/zufofukofojisegig.pdf
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/77d0f0.pdf
    • http://leaninrzpd.site/tiroides_y_embarazo_sintomas9cozg.pdf
    • https://nalufubuxozukex.weebly.com/uploads/1/3/4/4/134479837/rotemuvupo-sovojaximezi-zebixapiloti-bofixiseb.pdf
    • http://palitra-cveta.ru/where_to_buy_go_game_boardxrny4.pdf
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/5803c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wuvepilamamuse/chaalbaaz_1989_full_movie_hd.pdf
    • https://s3.amazonaws.com/wutogugej/blue_point_car_scanner_eecr1a.pdf
    • https://s3.amazonaws.com/xuxifuzituwu/new_jerusalem_bible_catholic_answers.pdf
    • https://s3.amazonaws.com/zarelusipofox/sistema_de_bethesda_papanicolau.pdf
    • https://s3.amazonaws.com/mamukawaxatali/swarm_robotics_ppt.pdf
    • https://s3.amazonaws.com/fuzafuzeruwit/clean_funny_answering_machine_messages.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_off0000c462.bin
53d903b6d1b0a9c630f724ac02294cefbc8a99ce2819a2b8af341c2982b47eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC462 5700 bytes
font_01_sfnt_off0000d79b.bin
e2f238435537b8cfbca6c88261e169d3eba9a3cf6bef80864ad864a4d3ce7001		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD79B 10212 bytes

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