Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac35a89828cb122…

MALICIOUS

PDF

80.4 KB Created: 2021-03-17 21:28:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a869dfe7b66ae1303840a32acfc9accf SHA-1: 904336846098f99ace567a415cdea633d363e1fd SHA-256: 6ac35a89828cb122d8ed1209585188e98b73ae42972e4427141b0064ffd5e7da
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating a PDF link farm and external URI usage. The document body, though truncated, suggests a utility theme ('Combiner plusieurs fichiers pdf en 1'), which is likely a lure. The numerous external URLs, including those hosted on domains like 'resalured.ru' and 'sqhk.co', indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/award?keyword=combiner+plusieurs+fichiers+pdf+en+1
    • https://cdn.sqhk.co/busumodofu/emWgiig/cbse_improvement_exam_form_filling_date.pdf
    • https://cdn.sqhk.co/potiribuwuf/gdE4hwE/labanix.pdf
    • https://cdn.sqhk.co/molodomo/idr5Hig/2717207552.pdf
    • http://de-bewertung-889562.icu/shadow_battle_2._2_apkaxkc8.pdf
    • https://simokenuma.weebly.com/uploads/1/3/5/3/135311421/7415645.pdf
    • http://autobuff.xyz/91185341227dbt8t.pdf
    • http://kinokaiff.space/aerofly_2_flight_simulator_2._3._19_apkjr951.pdf
    • https://cdn.sqhk.co/keropolor/eUv4hd1/83738952891.pdf
    • https://kowumawadixowiv.weebly.com/uploads/1/3/4/8/134888970/puwulawiluvotutip.pdf
    • https://cdn.sqhk.co/sirijunubi/kqangc9/hashtags_for_instagram_to_get_1000_likes.pdf
    • https://cdn.sqhk.co/zisubiziwu/iiauQml/vector_calculator_physics.pdf
    • https://cdn.sqhk.co/vakujediraw/hgXTFsB/monkey_touch_experiment.pdf
    • https://zuginapox.weebly.com/uploads/1/3/2/6/132695273/vegiv.pdf
    • https://cdn.sqhk.co/kunimanujage/heijXSh/67858990270.pdf
    • http://loseriwudovo.22web.org/93670393275.pdf
    • http://fineagencyy.com/what_are_the_best_survival_knivesphksh.pdf
    • https://cdn.sqhk.co/pulununese/46VHgjg/hello_neighbor_cheats_xbox_one_act_2.pdf
    • http://myfoxing.online/qasida_burda_shareef_english_translation5v4ur.pdf
    • https://cdn.sqhk.co/ribafesupuro/eiaOjeW/basalo.pdf
    • https://cdn.sqhk.co/bovokolel/dihdBhc/28780160436.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://suvumudupese.epizy.com/tibixigoduxutaf.pdf
    • http://kegogoxuxupi.rf.gd/avent_breast_pump_manual_boots.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_off0000faf2.bin
fee1d812608dccb94ff842c98e99ead77c10912ff2e5cd9711325f0399c69abd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF2 5284 bytes
font_01_sfnt_off00010cb3.bin
e536d3050373d54369dbcfe8c62187b4cc2f7f9f82f28d14a212f82263ca1626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB3 11996 bytes

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