Malicious PDF — malware analysis report

Static analysis result for SHA-256 68f91475c333cb62…

MALICIOUS

PDF

74.6 KB Created: 2021-03-15 05:51:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 003b31c48f37e124c13b6285422b1cd8 SHA-1: 633bebf19edb8ffbee658d10b674c88ff6f5ec8a SHA-256: 68f91475c333cb6251adbe6d06512c8a16b42f47868c24afc718440dc6cce456
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=thai+yazaki+cable+catalogue+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fccbdd2553c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449410/normal_5fdcf2fcb503c.pdfIn PDF document text
    • http://vobalemujumojak.mywebcommunity.org/how_do_you_fill_up_a_brita_water_bottle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446944/normal_604cf5c4a8a90.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/76437791900.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/00c9ceb4-dafe-44a2-9fa5-5ab8c6cc010f/zekesogenimafobesewefid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b140485-5a47-47f1-a4fc-615023a5e5c7/amish_cheese_store_clare_mi.pdfIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_40f7c3f9ba534dd6b40f32cd6a0647fe.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45066d70-7a13-417f-b137-26ed767e58fe/wheres_waldo_puzzle_canada.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_d4c1b60ef7764c50850329d5c1e95330.pdf?index=trueIn PDF document text
    • http://sabixukavizom.myartsonline.com/why_should_chocolate_milk_be_banned.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69cd490f-07b0-4cac-b285-6fe316b12007/tiperinusipirujozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbfb91ed-a43b-4dbd-aef5-1f63f7978773/gisune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3a07a1-dc7f-41a7-b81e-129b0572942a/will_tron_trx_reach_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8a2160e-d996-4f50-9c5b-7a686b3a61e0/how_to_connect_rca_cable.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_402a1b78dcae41c9a3786bc1e64d8e25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46edf64a-3c98-40c6-9f2b-4c0115103b6d/heater_not_working_in_car_at_idle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d99198-7c8b-46a4-b775-e7f6307b3693/what_is_sequence_connectors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81732380-8111-4e46-b853-c9007d74c8b3/the_making_of_the_west_peoples_and_cultures_volume_1_to_1750.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d68889f5-3d42-46ee-80d8-d4137491880a/vagumepobijofobufubodeb.pdfIn PDF document text
    • http://nomamazuzut.atwebpages.com/zimepajotenuteremuf.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_off0000e4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 5448 bytes
SHA-256: 75055465df7442bdbe078a16e8bceb564f0343608d08899116439c45d7b3e3a0
font_01_sfnt_off0000f776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF776 11072 bytes
SHA-256: f68472934db53aa285a1257d025ce6bdcb7b01c19d80369b1646c71f8a7745cc