Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd2efa01027bcf8…

MALICIOUS

PDF

86.7 KB Created: 2021-05-28 16:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a6ff50946c7873085622ac83a09e9ee8 SHA-1: 1f5ea1e2c86adfece29bef34ab3787dfccb3bce6 SHA-256: 6cd2efa01027bcf86319c3e6d09ae44d517bd90ce3c406e343c64ff9f9c63a54
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services like Weebly, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic firings strongly suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/123?utm_term=don%2527+t+starve+pocket+edition+beginners+guide PDF link annotation
    • https://gizajowi.weebly.com/uploads/1/3/4/3/134314542/543ef52d70.pdfIn PDF document text
    • https://pefekebemapufug.weebly.com/uploads/1/3/4/3/134370705/fosugelo.pdfIn PDF document text
    • https://tofibozuliven.weebly.com/uploads/1/3/1/1/131163910/9530b79d.pdfIn PDF document text
    • https://pobafegesodagiz.weebly.com/uploads/1/3/4/3/134305133/3152530.pdfIn PDF document text
    • https://tonibakak.weebly.com/uploads/1/3/5/3/135346506/nibigutababina-roxilabu-fafolab-dagus.pdfIn PDF document text
    • https://pudajimerexinag.weebly.com/uploads/1/3/4/8/134896131/9aba9d.pdfIn PDF document text
    • https://xuguxoxarakijob.weebly.com/uploads/1/3/2/7/132740494/ae6956ac3af7.pdfIn PDF document text
    • https://xaxusirawo.weebly.com/uploads/1/3/4/3/134318026/7677865.pdfIn PDF document text
    • https://dajurejew.weebly.com/uploads/1/3/4/7/134753869/xibedadededujodewux.pdfIn PDF document text
    • https://bufigolumixi.weebly.com/uploads/1/3/4/2/134234787/4845484.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/ae22c33e-fe4f-4024-8014-5557aa9233f1/en_sortant_de_lcole_animation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c35690e-9de5-4e31-a28f-fda50e36ade3/i_am_not_free_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33481879-0c1b-4150-bda1-95c6369577c5/best_programming_books_for_beginners_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfad4bb8-ded4-4a39-bc68-b179528505bd/rekidigejulilijopob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7731a3b7-172b-4f20-a513-6fe2ad80cbd9/biwidomegumiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5206c7-b15f-43d4-9400-eb7b2bc91eee/33218219782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91aa9278-8964-404b-a57a-0ba445a651e4/solving_quadratic_equations_by_factoring_maze_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884b4a56-d0fd-4b6c-881d-8d0be1241fcb/how_to_use_a_woods_timer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e012a1-3b22-4e69-9ea5-ca3355ca231e/soap_web_services_tutorialspoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e201a27-67fb-4b0a-8985-64ffb7849dde/how_to_fix_a_stanley_staple_gun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705428b4-6870-4d0b-b443-b4d568acb2ba/newanemegaruxemejadej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b45500-79af-4a39-b47a-ab26296115bc/dracula_bram_stoker_pelicula_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac4b7b3-2f2e-4252-b08e-652df1422abb/5840532600.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_off00010f3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 5504 bytes
SHA-256: 8040c0e9714c462fe82af154acd29e2d88e5fbbd037adc8540ef622d788fbdfb
font_01_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 13168 bytes
SHA-256: 2101e76222ae312a15fda317f8baa43b6fe6f5b76b7aa40a46af1d24d22bf164