Malicious PDF — malware analysis report

Static analysis result for SHA-256 08dc2780a3809b9b…

MALICIOUS

PDF

78.3 KB Created: 2021-03-20 11:00:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ad57e58d171ed23f54b6cc97b5b3982b SHA-1: 9fdfac436149e043516c867e9a129c28c6801fe3 SHA-256: 08dc2780a3809b9b409f54954889cabeb308e73f7e7f6af7687c137b9074aa35
156 Risk Score

Malware Insights

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

The PDF file contains multiple external links, with one prominent URL suggesting a lure related to "base64 decode pdf javascript". The ML classifier and ClamAV detection strongly indicate maliciousness, likely a phishing or trojan delivery attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=base64+decode+pdf+javascript
    • https://static.s123-cdn-static.com/uploads/4466172/normal_5feb32957b132.pdf
    • http://moxawunanenubop.sportsontheweb.net/aseptic_food_processing.pdf
    • https://cdn-cms.f-static.net/uploads/4454041/normal_601cdb415a7bc.pdf
    • https://cdn.sqhk.co/zipirevofu/yKOibNg/vonuxibazotixutabaso.pdf
    • https://cdn.sqhk.co/wazafanez/hajfijn/96923186991.pdf
    • https://static.s123-cdn-static.com/uploads/4505358/normal_5ff3c22ba42f1.pdf
    • https://static.s123-cdn-static.com/uploads/4420240/normal_5fc90adc0c2c9.pdf
    • https://static.s123-cdn-static.com/uploads/4529780/normal_5fc6a3e282190.pdf
    • https://static.s123-cdn-static.com/uploads/4368474/normal_5ff4c9a7bf794.pdf
    • https://cdn.sqhk.co/dosakupu/hjwgcFL/92094132011.pdf
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5fc8819780e74.pdf
    • https://cdn.sqhk.co/mepetiruzi/jcBQjff/tegifebi.pdf
    • https://cdn.sqhk.co/mopewedote/dhiggde/13738112491.pdf
    • https://pazerutafu.weebly.com/uploads/1/3/5/3/135392620/zamuvazojak-tezaregud.pdf
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/bodutumaxor-kejedujo-risixudixolix-xozok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://motuvogipe.onlinewebshop.net/gazoboxubitaruzajipipuzu.pdf
    • https://uploads.strikinglycdn.com/files/282601cc-efdf-46b0-83ce-446d1c12b4c3/applying_gardners_theory_of_multiple_intelligences_in_the_classroom.pdf
    • https://uploads.strikinglycdn.com/files/08ae3a57-02cc-4c2c-ab71-707dbee47eda/xbox_1_controller_charger_pack.pdf
    • https://uploads.strikinglycdn.com/files/afd90c1e-48f8-4a7e-876b-b76c32c90076/how_many_calories_in_a_panera_bread_asiago_cheese_bagel.pdf
    • https://uploads.strikinglycdn.com/files/089ab73e-fc9a-424b-9dc6-98bbe5552351/mupijaguxexasaf.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_off0000f43d.bin
13c4d3c87457b6bd643552cb6bbb81e7fdab3c4e0b3ea11e05c4a1b9016c212c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF43D 5544 bytes
font_01_sfnt_off0001073f.bin
8942cc3567be0bd25362ddcf15b7d76e2b204be9efbf3b58c1abd3380a4b6d76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1073F 11072 bytes

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