Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b22c261570ef464…

MALICIOUS

PDF

74.9 KB Created: 2021-06-01 17:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 671c7ec24662bc3c429de706d6a22d8e SHA-1: 79fed315857a0a9cb86ed43403670757726ff3f2 SHA-256: 7b22c261570ef464fec9437a1f5e06df156c4833a0c1f5668c1cebf4c8a11031
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One prominent URL, https://pixomot.ru/pbw?utm_term=battleship+battle+game, is directly referenced. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. No scripts were extracted, but the structure suggests a link farm designed to manipulate search engine results or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/pbw?utm_term=battleship+battle+game
    • https://static.s123-cdn-static.com/uploads/4445532/normal_5fc9c9024c929.pdf
    • https://static.s123-cdn-static.com/uploads/4501975/normal_5fec987768e5f.pdf
    • https://static.s123-cdn-static.com/uploads/4383792/normal_5ffb94088cf67.pdf
    • https://xisilejawot.weebly.com/uploads/1/3/4/0/134016881/nelek.pdf
    • https://zopoxetofosifa.weebly.com/uploads/1/3/4/8/134863155/6d3772a.pdf
    • https://cdn-cms.f-static.net/uploads/4470405/normal_605682e347a2d.pdf
    • https://sotubuponin.weebly.com/uploads/1/3/4/6/134644868/6913915.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://funinupun.pbworks.com/w/file/fetch/144424899/38086348744.pdf
    • https://uploads.strikinglycdn.com/files/381fb2cc-3670-4a87-b12a-4de5e17f1618/kenmore_elite_top_load_washer_model_796_manual.pdf
    • https://uploads.strikinglycdn.com/files/1c71a22d-7f6c-4243-ac00-47da65895d95/23311084801.pdf
    • https://uploads.strikinglycdn.com/files/37b9728a-703f-4c4e-8bd0-fa5b2bb55a8e/sikudamarafaz.pdf
    • http://zexowisam.pbworks.com/f/is_r6_insulation_worth_it.pdf
    • https://uploads.strikinglycdn.com/files/82c31a67-71f0-47de-aebf-5f2250f2f721/top_100_business_ideas_in_africa.pdf
    • https://uploads.strikinglycdn.com/files/a57d5fea-c5bb-4177-829d-cfa67548935d/the_final_quest_rick_joyner.pdf
    • https://uploads.strikinglycdn.com/files/61ea4eb7-f9a8-420f-a867-ab4291d393ab/manual_book_sx_mini_g_class.pdf
    • https://uploads.strikinglycdn.com/files/75b9143a-cb73-4503-9952-242434ba5f3c/what_reading_level_is_a_little_princess.pdf
    • https://uploads.strikinglycdn.com/files/5c7bdb05-1eb5-4b51-b4c2-91e9d5152dca/whats_a_good_name_for_a_male_horse.pdf
    • https://uploads.strikinglycdn.com/files/6efa3f94-d75f-41e8-9531-153b582fcb9f/34728184218.pdf
    • http://bofamawetodo.pbworks.com/f/a_christmas_memory_vocabulary_practice_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/7b7baad5-e55a-4928-8b5c-a8784bec9b02/31145281766.pdf
    • https://uploads.strikinglycdn.com/files/ab2420f4-c050-4131-ba14-dd04e25fe60a/techno_beat_electronic_keyboard_melodies.pdf
    • https://uploads.strikinglycdn.com/files/2a9d16f7-728f-4529-a4c3-589c571ca4a4/13130054978.pdf
    • https://uploads.strikinglycdn.com/files/adfc400b-7c8c-4809-8dc7-d5d3154c1d2e/76277815800.pdf
    • https://uploads.strikinglycdn.com/files/607ee29b-25fc-435b-b04a-b42b4a764d51/75293616549.pdf
    • https://uploads.strikinglycdn.com/files/f2946e1b-adfb-49ec-9f5e-327f9119e60b/15421343784.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9f.bin
311773567766fd365a8118423fcfb6c0cb765a181d48e56462563b0a6096efdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 5328 bytes
font_01_sfnt_off0000fc99.bin
97ea5c96893f4fb1e718273f13ae73ebeda97fabecd1fda77f9a43319c5e01a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 9852 bytes