Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e20d1dc9d79bfb3…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 06:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3a7d89ee9b28d90888885457d68e3cfb SHA-1: 0a881cbfae55fae2b999e5478c383fd4d6b1f167 SHA-256: 5e20d1dc9d79bfb311543cc54f0add7855212b6c0d1920adcb3daaf27ba50785
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or content stuffing tactic. One prominent URL, 'https://lozipotod.ru/award?keyword=certificado+medico+prenupcial+mexico+pdf', is likely a lure to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://lozipotod.ru/award?keyword=certificado+medico+prenupcial+mexico+pdf PDF link annotation
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/fugapuzupevowop.pdfIn PDF document text
    • http://golivexi.22web.org/doraemon_new_movie_mp4.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/FhcjhDM/lovecraft_country_season_1_episode_2_recap.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovixovuti/ifOhzgi/tedotavazunites.pdfIn PDF document text
    • https://cdn.sqhk.co/tujarazimok/hdk1Q8n/steam_link_disable_hardware_encoding.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/68273.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/xalasawu/best_old_school_cast_iron_skillet.pdfIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_28c2d0e5e81547feb3ece212e2cd1af8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/78215093978.pdfIn PDF document text
    • http://lobulowigewimu.epizy.com/lilegojarixegefomagaloje.pdfIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_50e308366e0344098dfa3c311b597918.pdf?index=trueIn PDF document text
    • https://6cf80756-66c2-4d2e-b15d-ff1677cb7115.filesusr.com/ugd/2257e8_d69a1c79c54e40a6bdeb13415984d2d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/telasebisu/sigumemegavigiweb.pdfIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_5fa6dc3eebab475da14bde12fde78b2a.pdf?index=trueIn PDF document text
    • http://tebevem.rf.gd/belimbing_wuluh.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_a83deda301ad413db289cbf04a6f44a6.pdf?index=trueIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_fbf88467b0394bd6ab17456b9284b4ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/somamere/job_application_form_template_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/telugu_hd_movies_sites_list.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_bf2d336a72114258b5eb39746c08c84b.pdf?index=trueIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_1275a64e97c643309f89150ea116864a.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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 5096 bytes
SHA-256: 182d09f1cee9704e0c2fab982fe13621e97ffa9dd64e54bf5195e0803dfe7913
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 11816 bytes
SHA-256: 8813e299a7c342a076503560a927e1491fb21f64844623f44e1d9f20fd829c6c

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