Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5a9f424e6d7cf8…

MALICIOUS

PDF

70.9 KB Created: 2021-06-08 13:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1fab8e6e16ee9ff12480ef662915ee33 SHA-1: dfae849a9c97287cb078ca8cb215ec6c6dc0ffbf SHA-256: 5f5a9f424e6d7cf80e2a2945f755b081ef148e5c4c3df14cd44b2f665d9075c2
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a link farm with multiple external URLs, some hosted on disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/pbw?utm_term=can+i+use+bitmoji+on+my+mac PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470683/normal_6004eed83c58d.pdfIn PDF document text
    • https://lukibufipijuzom.weebly.com/uploads/1/3/3/9/133997252/3310479.pdfIn PDF document text
    • https://mudekireziwafa.weebly.com/uploads/1/3/4/7/134730614/liwatuzodesumo_ritogexumezap_moxafavugejosa.pdfIn PDF document text
    • https://xadajepiba.weebly.com/uploads/1/3/4/5/134589644/116812.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5ff7d5b88db71.pdfIn PDF document text
    • https://xadifopelizil.weebly.com/uploads/1/3/4/7/134771643/kikewudala.pdfIn PDF document text
    • https://xowivana.weebly.com/uploads/1/3/0/8/130813667/zeripenapupex.pdfIn PDF document text
    • https://wumaluko.weebly.com/uploads/1/3/4/7/134716396/9ef265ab2f8.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/6ea592ef-15e6-4355-8418-4b781c668696/how_much_to_rent_a_bobcat_skid_steer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fbfdf4e-afaa-4de6-b2b3-6d29acacb7c8/47784296338.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9ee1e5-d4ea-443d-8774-55a78517e1fa/characters_of_animal_farm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788b86ea-0d3b-4387-aac9-bf37c167c0ec/1686301422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d655ca4-96cc-4fbf-88ef-626524b2f391/dantes_inferno_canto_6_full_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a37ad27-53e9-425e-b167-1f23599f8f7f/hp_laserjet_pro_400_color_m451dn_toner_cartridge_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc890a5-ea7a-49aa-8026-79476f3eb207/95878180383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a1ff76f-55c7-431d-8de3-cbe6508c2f9d/majestic_gas_fireplace_insert_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e706173c-d85e-4ac1-a816-181089d6c9a0/maytag_2000_series_dryer_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a499db6b-3f8f-45e8-ab1e-a4aa1f2297cc/what_are_three_things_you_want_to_change_about_yourself_interview.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_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 5040 bytes
SHA-256: 17e6e4162ac01cb14e3e3e83be2d1ee959f57868aaef98357685ca599607beab
font_01_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 10148 bytes
SHA-256: 5d54831918fae09d06fb5e5eeb0a0deabb12f1d5bd262318ae6b526f40eb3598

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