Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ff36cb24352cb1…

MALICIOUS

PDF

74.5 KB Created: 2021-04-04 03:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 323e9724350e1b1a4837290e21e45362 SHA-1: 70873d4dfe783455b796551839afa3cd274e0eb3 SHA-256: 49ff36cb24352cb134c56d3507e6bcbd9cc589fef397485e0d705631ef1f1f10
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://maypoin.ru/award?keyword=jaquar+sanitary+ware+catalogue+pdf PDF link annotation
    • https://weluperexofabed.weebly.com/uploads/1/3/5/3/135382791/bitivufoloropagile.pdfIn PDF document text
    • http://botefedej.sportsontheweb.net/33961544489.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/wEghVgi/tumutonujuwosetokozu.pdfIn PDF document text
    • http://kigalasabipigo.medianewsonline.com/analepsis_definicion.pdfIn PDF document text
    • http://koponegigat.medianewsonline.com/types_of_text_structures_in_informational_texts.pdfIn PDF document text
    • https://mabatuba.weebly.com/uploads/1/3/5/3/135303696/donuzifubeto.pdfIn PDF document text
    • https://wovukevaz.weebly.com/uploads/1/3/4/5/134523328/ridurimopen_golegazivomen_nefomikifukemem.pdfIn PDF document text
    • https://nojasiputijaze.weebly.com/uploads/1/3/4/8/134869787/jozofek.pdfIn PDF document text
    • http://sugakibabusu.scienceontheweb.net/86455721258.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxunoromi/qCfjjmf/alchemy_leveling_guide_tbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_9c5f7d9c737a4e07b50e3bb3c0ce2672.pdf?index=trueIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_5dc741bc112e4879b01e1b77d26b8d3d.pdf?index=trueIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_d86ef413a3af4c178e31b50152c680e0.pdf?index=trueIn PDF document text
    • https://28ae28a3-27cc-4d38-be83-0de1f6925f83.filesusr.com/ugd/454016_84a62291b945486484bf532d2411f5cd.pdf?index=trueIn PDF document text
    • https://dd91dc4b-d2fe-4aab-ab17-22023aa64d5b.filesusr.com/ugd/f05b1d_f07c038c26c248828f9c58c475b2b8d6.pdf?index=trueIn PDF document text
    • http://sojusenetuki.onlinewebshop.net/8259352417.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/68907667888.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_d4fcbe5266d340779a40a57ad1859569.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_ebbfbe9a8088478aa1960dba71a29591.pdf?index=trueIn PDF document text
    • https://722d0b64-886f-48d6-ad1d-3f240095bb95.filesusr.com/ugd/07f6b3_6200f434281b4124b187989ef3133a34.pdf?index=trueIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/que_es_y_que_caracteristicas_tiene_un_ensayo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD068 5632 bytes
SHA-256: f6de183eb6eac6286c709bee19f2fdc61b7cd148c581cc37ec58e793380cb295
font_01_sfnt_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 9932 bytes
SHA-256: 502c2e3825f84c8a5db7b7912546302c667df840a7f1e3c71b1f71dbbe2480c0
font_02_sfnt_off00010595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10595 16172 bytes
SHA-256: 7f268005b80ff82e89639affb95403f55eddb42516abbde6a76e27226db124cd