Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c3f4aaf7d70fcf…

MALICIOUS

PDF

77.4 KB Created: 2021-03-08 03:43:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10e975bc35419600a504f36648fa0eb7 SHA-1: d712a5758b9ab3198c68349e3bb4a3ebbe1ca243 SHA-256: 38c3f4aaf7d70fcff8595ce2bfeca09a97ea5d4b4c29bd60011009a1049d77c1
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, including a suspicious URL hosted on 'mezovuduw.ru', suggesting it's part of a link farm or SEO manipulation scheme. The document body, though heavily obfuscated, contains keywords related to the embedded URL, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=foam+head+for+wigs
    • https://static.s123-cdn-static.com/uploads/4421959/normal_5fe3dde4a8b1c.pdf
    • https://cdn-cms.f-static.net/uploads/4468823/normal_601710d0ecbab.pdf
    • https://cdn-cms.f-static.net/uploads/4490365/normal_601f832474ea8.pdf
    • https://cdn-cms.f-static.net/uploads/4381748/normal_60403f37cefe9.pdf
    • https://static.s123-cdn-static.com/uploads/4369794/normal_5fddf6684d6ea.pdf
    • https://static.s123-cdn-static.com/uploads/4444366/normal_5fc692dedae93.pdf
    • https://cdn-cms.f-static.net/uploads/4482009/normal_602949483819f.pdf
    • https://cdn-cms.f-static.net/uploads/4367645/normal_6022b6b75d21f.pdf
    • https://cdn-cms.f-static.net/uploads/4446633/normal_6010aae3e2253.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_7712258a894a45d0bbbd55e550285c39.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87fefa77-7468-4b28-b71c-04e4d1972e70/does_accu_chek_aviva_plus_have_bluetooth.pdf
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_4768dae1e69346d981d38e7c9eccba76.pdf?index=true
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_dad340d29b034addaf8d9867c5bd7ef1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a9c2cefc-7a6a-4359-91bb-70c940f27861/fiwiwuterejasi.pdf
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_515c09623cb145b1893b8604c0c7f17d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4b31e480-5892-4ef5-801a-5c005b70948e/togiseporufiveninitetowe.pdf
    • http://paguxesij.myartsonline.com/weather_and_climate_activities_for_3rd_grade.pdf
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_094e34836917459fbebf2d298372a598.pdf?index=true
    • http://kivozusemu.atwebpages.com/pemevadok.pdf
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_f180b9a13b2f4b1db21fb8f5b4914fb3.pdf?index=true
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_0d2857bc313d498396fb821fe073d898.pdf?index=true
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_f9bf299dc16048209ee80c667f758562.pdf?index=true
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_b4a037f1fe664c6b9347cbf03c263b97.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1fd9f510-31d4-4085-8e70-675adb8d4a70/vishnu_sahasranamam_procedure.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_off0000f1e2.bin
abac44dd7f3961fa2a475a8154ab641059b3c15bda9b6283a7a66cb360740e41
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 5336 bytes
font_01_sfnt_off000103f9.bin
59b6e94f2f2ddbe8e6c8e6ec7a2b36ac6aa326762f0d6e9f1cbfb1e73d771652
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F9 10544 bytes