Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3c9748c3300035…

MALICIOUS

PDF

73.2 KB Created: 2021-04-02 18:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5a5f4626aeeff3af79c95b25444b2960 SHA-1: 99893db820ad066ba9f563e18e34dde3c62ea9cf SHA-256: 0d3c9748c33000353654af57a8bf3af20768202e7132fffb25ba97599b57a9ed
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/strik?utm_term=which+of+the+following+would+be+classified+as+a+financing+activity+on+a+statement+of+cash+flows PDF link annotation
    • https://dufemejilesola.weebly.com/uploads/1/3/1/4/131453127/28f41.pdfIn PDF document text
    • http://moneyindia.site/how_to_download_sky_factory_1s0ha1.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/simple_promissory_note_template.pdfIn PDF document text
    • http://sewawena.scienceontheweb.net/calculus_notes.pdfIn PDF document text
    • http://presentinsta.online/xesarirujoj1bimy.pdfIn PDF document text
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/5063892.pdfIn PDF document text
    • https://cdn.sqhk.co/simumufij/Dlsghjf/18674303451.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/dowajeb.pdfIn PDF document text
    • http://youtube-subscribes.com/how_to_use_a_safe_can_openerhvtxe.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/eCOhggi/38864297575.pdfIn PDF document text
    • https://cdn.sqhk.co/vamunidibu/ighhVbX/71532588393.pdfIn PDF document text
    • https://napuguvu.weebly.com/uploads/1/3/0/9/130969658/cc3df68.pdfIn PDF document text
    • http://xeberul.mywebcommunity.org/pabepobexowefogisixerowe.pdfIn PDF document text
    • https://rarasuxa.weebly.com/uploads/1/3/1/3/131398432/81d3dbb331bc858.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wukara/pivosivivogataripaxirerez.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/family7_joseph_prince.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/asus_sabertooth_z77_specifications.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_4721edf865214e9fa9c56e08c9077241.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_dbde7f3dc69442828eb74ed8270209b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godewumazek/how_do_you_win_at_roulette_every_time.pdfIn PDF document text
    • https://8d2868a3-57b7-484c-81f6-493c1c4f5daa.filesusr.com/ugd/a8ca0f_2dfba9dedd534ed895545b8e63b7b3c8.pdf?index=trueIn PDF document text
    • http://zivexotafoni.myartsonline.com/lonely_shepherd_free_sheet_music.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_a0e110debe254c48910256f07dce01c9.pdf?index=trueIn PDF document text
    • http://pabotojixupi.atwebpages.com/dd_monster_manual_5e_free.pdfIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_2b1dc7c4182b40bd8dd6b8567737ff8e.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_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 5744 bytes
SHA-256: ef4032394205f60e41e8a0fef9e9de781f676cbc8f8688c872eb0bd0e7cb373f
font_01_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 11140 bytes
SHA-256: a6fd23a26e08e8338ae08e82a44645afdb3b1e4c0e6bab59723a74322034a3eb