Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a066d38d2099ddb…

MALICIOUS

PDF

81.3 KB Created: 2021-04-06 17:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e26026a686205edd6a995363102dc48e SHA-1: c50e1a8b2322e721b8fc06deedb1f81ee1629f6d SHA-256: 9a066d38d2099ddb3bd2246438e0d5d67008cb6a4988e8056ed96d2b1daee6b4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to manipulate search engine results or direct users to malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it acts as a lure, potentially leading to further exploitation or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=mini+world+block+art+guide PDF link annotation
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/4e579.pdfIn PDF document text
    • https://nobixerevogug.weebly.com/uploads/1/3/4/4/134481004/734812.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/muwarikirow.pdfIn PDF document text
    • https://getaforufuzok.weebly.com/uploads/1/3/4/7/134733873/5715148.pdfIn PDF document text
    • http://tuxiwos.iblogger.org/battletech_clan_invasion_salvage_box.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/what_grade_level_is_wings_of_fire.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/45437147085.pdfIn PDF document text
    • https://voloripilobolim.weebly.com/uploads/1/3/4/6/134635915/03104e4f875.pdfIn PDF document text
    • http://wedevaz.sportsontheweb.net/xufirejibakanefuniv.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/is_boston_market_open_on_christmas_day_2020.pdfIn PDF document text
    • http://lumejaramelu.mygamesonline.org/acid_rain_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_d3ffacd5a4344e60bfb228924d3d448d.pdf?index=trueIn PDF document text
    • http://jopubijako.atwebpages.com/bazabosegu.pdfIn PDF document text
    • http://zozevep.epizy.com/10295291547.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_19e0d0ec1e594b68af69ceae2690dc55.pdf?index=trueIn PDF document text
    • http://rufedum.rf.gd/sudenidefutedajipitis.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_141d4034e51a47c58d9004fe3b37251a.pdf?index=trueIn PDF document text
    • http://safadixuzet.rf.gd/citroen_c4_cactus_2015_manual.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_41e2e04f32d9452e95778c475c6b67f8.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_80e6bdc4a10d456faf347edd9df74709.pdf?index=trueIn 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_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 5228 bytes
SHA-256: 7b577a38dbed6e7ff58f7ab04f8658b181162ddd68f916ae1be78e2663e0bf17
font_01_sfnt_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 11032 bytes
SHA-256: fc8c03b204f1e471e3178c23825f4e6c7faae409d2f078418cf81a36c7f7aafb

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