Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcac5e438a8d16f7…

MALICIOUS

PDF

79.2 KB Created: 2021-06-02 18:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6ccbdfbf02bf446c214f3eaf7e17924 SHA-1: 2782d3eda3f934b086eda0243dbd5335651677fb SHA-256: fcac5e438a8d16f744cf9893547c1d18792780128a6ea6aafa78052c170864fa
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to be a lure, possibly related to a user manual, to entice users to click on the embedded malicious URLs. No scripts were extracted, but the overall structure and heuristic firings point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=jeep+cherokee+2004+user+manual
    • https://wogazisaralo.weebly.com/uploads/1/3/1/1/131163660/c8d2973a1998a32.pdf
    • https://cdn-cms.f-static.net/uploads/4482618/normal_6041ca6a74669.pdf
    • https://sapafusazefo.weebly.com/uploads/1/3/4/4/134496158/612f792b4fada.pdf
    • https://static.s123-cdn-static.com/uploads/4496826/normal_5fe5d69af070c.pdf
    • https://cdn-cms.f-static.net/uploads/4390366/normal_5fe9d394ae43a.pdf
    • https://static.s123-cdn-static.com/uploads/4472481/normal_5fca6e9093613.pdf
    • https://falumegobe.weebly.com/uploads/1/3/4/7/134702986/purikenegitevun_watelunisi_retinonil_doravunos.pdf
    • https://static.s123-cdn-static.com/uploads/4408483/normal_5fdeb0cd58203.pdf
    • https://cdn-cms.f-static.net/uploads/4369142/normal_604a9a6f97761.pdf
    • https://puzuzabijil.weebly.com/uploads/1/3/2/8/132814257/bavasaw_sibupigeruj_volibove.pdf
    • https://kotekadugufed.weebly.com/uploads/1/3/6/0/136086248/fatelimevot-zezixewologim.pdf
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/zorigid_degafopovo.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/kexinu.pdf
    • https://cdn-cms.f-static.net/uploads/4476782/normal_601493d45084b.pdf
    • https://xotomunekezej.weebly.com/uploads/1/3/1/0/131070571/dukopirupow-nozudolulu.pdf
    • https://nexawukuvinu.weebly.com/uploads/1/3/4/5/134578226/mawogunitugitiki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/233cfc1f-6bc7-435b-9e99-084e30da9bfe/64324791676.pdf
    • https://uploads.strikinglycdn.com/files/f8a6dee8-c1db-4bfc-adff-3f3baa423122/android_oyun_club_clash_of_clans_hile_apk_indir.pdf
    • https://uploads.strikinglycdn.com/files/9c013074-a7a7-4f8f-82e1-2a76ed2cf6d3/vorajexax.pdf
    • https://uploads.strikinglycdn.com/files/8d429506-56a5-4251-9de1-e6968aca2bfb/zejukilegijobanuwifixuf.pdf
    • https://uploads.strikinglycdn.com/files/56b736c3-6ba6-4951-b2b6-373797158779/remivafobifuxawopalakad.pdf
    • https://uploads.strikinglycdn.com/files/34396835-c6aa-4d78-b2e4-6d6203b9bf85/2004_chevrolet_malibu_engine_3.5l_v6.pdf
    • https://uploads.strikinglycdn.com/files/392cb77f-cd43-4be3-83fe-c9da0f235602/lagidefugis.pdf
    • https://uploads.strikinglycdn.com/files/7b7a4df3-7b9f-41ad-af70-770d3c98dd40/pozeborepilenis.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_off0000f814.bin
7ed58b5947c0b5784987ec4e1107b6108683cb5f73715bdcac91bfc2b7d00ac3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 5588 bytes
font_01_sfnt_off00010ae9.bin
b6b61355c421975e51c77a0d51d21a1c99b1f723bb223de02e29e36d2dc9247a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE9 10676 bytes

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