Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67086e820ba296c…

MALICIOUS

PDF

80.3 KB Created: 2021-03-19 23:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4b6f3dedbbd3aca621decb9f26f1163 SHA-1: d0002fa6ccf7558ff2859aee02d3f6827e7cca80 SHA-256: b67086e820ba296c88ca4d2d22e2517d5465dbcb123b4b23c87e164b239f0858
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous external URLs under the guise of providing organizational chart templates. The primary purpose appears to be directing users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • 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://golowaki.ru/123?utm_term=organizational+chart+template+smartsheet
    • https://static.s123-cdn-static.com/uploads/4402745/normal_5fff69a646b3e.pdf
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5fd1f221e014a.pdf
    • https://static.s123-cdn-static.com/uploads/4490953/normal_5ff926eedb03c.pdf
    • https://vegilumos.weebly.com/uploads/1/3/1/3/131383621/xemanasavunofu.pdf
    • https://cdn-cms.f-static.net/uploads/4479917/normal_6031f3bf8829f.pdf
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5fcb9f6320134.pdf
    • https://static.s123-cdn-static.com/uploads/4449779/normal_5ff5545e937db.pdf
    • https://mukaperu.weebly.com/uploads/1/3/4/6/134649449/luvotafu_mifoviludu_penit_genawedijara.pdf
    • https://kafunonedejo.weebly.com/uploads/1/3/4/6/134662894/ebb52225f1a44.pdf
    • https://cdn-cms.f-static.net/uploads/4486200/normal_604d3d9838d10.pdf
    • https://fubiliretule.weebly.com/uploads/1/3/4/4/134489125/3777704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9e8730b9-2d50-4ad0-8d6f-20ee9c004f8c/22947070348.pdf
    • http://gugikimu.rf.gd/brown_bear_animal_spirit_guide.pdf
    • https://b36ad067-21ef-4b17-9055-1dfcbb3fb98c.filesusr.com/ugd/8673ad_63e1664382604c4eaa908963b2a6b0ee.pdf?index=true
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_7f847ded16be49e293fa66a879da78aa.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1110b9b2-3eee-4659-bb6a-c8cd74983f35/witizatofusimamawure.pdf
    • https://6fc76513-a17a-4053-940d-bef108f5ea85.filesusr.com/ugd/3a5ef0_e350d01f81074568a36f3c063053b715.pdf?index=true
    • http://lesuzikabe.epizy.com/fawalabiwiruxelu.pdf
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_421a4bef6e3d45f1aacee120ae8eb5e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9aeec785-ce4d-48a0-885a-c8fd841e19c4/fuziwodabanuko.pdf
    • https://uploads.strikinglycdn.com/files/5e8e7c37-035b-4e29-88b9-5c285ec88cfe/75588700593.pdf
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_80f00a27771d405199556afc15e78bdb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5ff36998-3d67-4394-8937-30dfdbc3b4db/why_is_smoke_detector_still_chirping_after_battery_change.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_off0000f23a.bin
79ba019bfe426c6f9103445db2c0a557db8727616a38d250b623f706a00f88ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF23A 5424 bytes
font_01_sfnt_off00010488.bin
5511f08999cb3f9b61a64d270c7b1ce6b6fccc8ec1887988eceb2669b46aae30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 14196 bytes

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