Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36dc907d1fcb6a8…

MALICIOUS

PDF

80.9 KB Created: 2021-06-06 02:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3aa0ad5fae9aebe840daaf6174b0f6ed SHA-1: 9c3f438f2e718f62d9234cdeb8c8f7721d53137c SHA-256: a36dc907d1fcb6a869b56269b6e210fa96bf3ad7c85f8b9be6ce91b979f3e7b7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dugedepap.ru/123?utm_term=homeready+course+answers PDF link annotation
    • https://kutepuwabaluv.weebly.com/uploads/1/3/2/6/132681670/e782da3d4fce1ac.pdfIn PDF document text
    • https://xefulexemifin.weebly.com/uploads/1/3/1/3/131398452/2463344.pdfIn PDF document text
    • https://neranutedaxujaw.weebly.com/uploads/1/3/1/4/131407849/zuxelevez-muletez-wameb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453734/normal_5fc6701889ff4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495390/normal_5ff1428ec8d32.pdfIn PDF document text
    • https://noderewowiful.weebly.com/uploads/1/3/4/5/134596184/0ee1a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423443/normal_605833a824ba6.pdfIn PDF document text
    • https://wopixidotawus.weebly.com/uploads/1/3/4/5/134506387/nemepag.pdfIn PDF document text
    • https://xurepisex.weebly.com/uploads/1/3/4/7/134718841/6924952.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/batekesiriwipuw_sujelamobirav_tisixiraxojed_tesejomigam.pdfIn PDF document text
    • https://xeneniwavufew.weebly.com/uploads/1/3/2/8/132814439/zemefebelidi-buxenufagilug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428033/normal_60ba26f1f2478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458634/normal_6057e60a0c5ac.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/a4a4e0c5-bffe-4699-afba-867861fc62f9/96982283373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d35e6c8-1a02-4451-87de-8a6fed283a91/which_family_has_2_valence_electrons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2b1f8db-dfd7-4876-af8a-6db6f1a9b8b8/jack_reacher_movie_cast_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1e7cc2-997e-4b9b-9f84-1ab8a24c8c53/mulanuzatix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69ac94e-9c16-4615-ac3e-76643f150faf/german_story_books_for_beginners_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7653505f-9a6f-4731-9f08-1355063a0af0/britax_boulevard_70_g3_installation_rear_facing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c64a2381-42af-4c9e-a80c-89880b88d217/walukejovopanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcc24f04-2ab6-42fa-8491-0ce826db09cc/59863481990.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb825ba8-000e-4926-a4cf-e9d4e0b5a08f/ivan_niven_number_theory_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48c8103-b727-4879-9093-4a681f1f80b4/how_to_get_a_class_b_cdl_in_oklahoma.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_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 5208 bytes
SHA-256: 5ef9b6fdd62b395db063cbaa66fb4da826e7796394e619de8261b64e02208764
font_01_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 10952 bytes
SHA-256: a91b079955a43889b9170f4358c7db69703bde3aa362b2f76a91ae599638f81b

Open this report in the interactive analyzer, or submit your own file for analysis.