Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3761f0a1ebb7b7…

MALICIOUS

PDF

127.4 KB Created: 2021-03-17 10:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c582fbbaedc6ba20f3439b59858ce3e7 SHA-1: 9482463a203b3d1cfd4bda71c3bc20d599972b52 SHA-256: ef3761f0a1ebb7b7913f3a3905da849b30d62ad024602931d9656b295018c21a
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 0.9995

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://nipisod.ru/wix?keyword=d-link+dir-615+setup+manual PDF link annotation
    • https://dapadode.weebly.com/uploads/1/3/4/6/134646205/vogajotobi.pdfIn PDF document text
    • https://lerizizevu.weebly.com/uploads/1/3/4/3/134314130/c3ccb9a2e.pdfIn PDF document text
    • https://xugibadibexupov.weebly.com/uploads/1/3/4/6/134684970/7862216.pdfIn PDF document text
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/zunavakidivin.pdfIn PDF document text
    • https://vorexumezekadan.weebly.com/uploads/1/3/0/9/130969740/dinidi-liwad-pazonuvet.pdfIn PDF document text
    • http://dipufuvolog.iblogger.org/galaxy_attack_alien_shooter_mod_android.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/3cf51ba3-f9b2-4eb2-b58f-114dd4093c54/pawedilimidetefowegonuxur.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/all_punjabi_remix_song_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/what_makes_a_contract_void.pdfIn PDF document text
    • http://lokanubuxona.rf.gd/lomasuzopaderelufupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0dd060-690e-4e71-b472-5add9371be04/fikofuzetefifir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7be7149-f7d6-436c-9c39-d5e2776746f8/dd_5e_cleric_domain_spells_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/737b1f1e-2811-4ae4-9739-dc29ce0459d9/advanced_dungeons_and_dragons_monster_manual.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_e97ea163d4ea45118ea507f3c53a7320.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_e426def0ff594f73a2a96569a60178e2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a8c7fa6-5344-498b-89cd-3dcef15706b1/how_to_replace_a_valley_shower_faucet_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91794e9-47c6-405c-8c2b-33d2f374b77f/how_to_empty_capsule_container_nespresso.pdfIn PDF document text
    • http://pisuwemale.epizy.com/lifotolasumigozuliko.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/59189056082.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/housing_guide_dog_puppies.pdfIn PDF document text
    • http://jiwenufaxo.epizy.com/jejopafoxujag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af63f9c-4e27-42a7-a34b-8d56337be45c/34665941.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e0c3bf6-da69-48a2-b3b1-feb4b0abeeca/227252396.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/xamimadi.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_off0001b17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B17D 5532 bytes
SHA-256: 4dd91c38cc843c3a23656e90906b50aca9d97389df909ff49ce5213bb3be1b0b
font_01_sfnt_off0001c441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C441 13388 bytes
SHA-256: f384e87c16571fc51f875de7ff35c58e8424f7b9e7acde57e22c29427c3d54cb