Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7efd887683547dd…

MALICIOUS

PDF

84.3 KB Created: 2021-03-24 11:45:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94e2a79f86083e6fc2196e03a57fc85b SHA-1: d7091d7682477aa9e05374458e7151a9efaa7897 SHA-256: d7efd887683547ddcf9779c85d2ad6bf2863b6532ce43bc7403efbc03f9c057a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=cbse+maths+book+for+class+4+pdf
    • http://jabudapitu.scienceontheweb.net/narovafixavejufixiwuv.pdf
    • http://topukovatawosu.sportsontheweb.net/holistic_marketing_orientation_model.pdf
    • https://static.s123-cdn-static.com/uploads/4374518/normal_5fe3dcb77130d.pdf
    • http://sepozimog.scienceontheweb.net/arban_trumpet.pdf
    • http://biwedujurar.mywebcommunity.org/14164483283.pdf
    • https://cdn-cms.f-static.net/uploads/4421969/normal_600bbf2edb269.pdf
    • https://minezutoka.weebly.com/uploads/1/3/2/6/132695516/4b0a3831a543.pdf
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/1579625.pdf
    • https://bixoriwapavam.weebly.com/uploads/1/3/4/7/134731951/zanule.pdf
    • https://muxoramosuzuveg.weebly.com/uploads/1/3/4/2/134266249/8858137.pdf
    • https://fadagesaxe.weebly.com/uploads/1/3/4/5/134587500/6fb376d64.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://dirulibas.onlinewebshop.net/milufonat.pdf
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_9b9073d4787d446c9dcc60a28efdf17e.pdf?index=true
    • http://bifovigavij.myartsonline.com/dark_heresy_ascension_fr.pdf
    • http://xabudavadeguvo.myartsonline.com/8976736074.pdf
    • http://naxepedawizozet.onlinewebshop.net/the_things_we_do_for_love.pdf
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_d0a2ce032d8d4ad8a1943d29cb19fae1.pdf?index=true
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_60722030770d4ff6acaf3737b0bdafa3.pdf?index=true
    • https://86042ffc-9b62-460b-8552-fb2522205a17.filesusr.com/ugd/4f92c1_22a37fe34ba74cd187d0cc8ac912471a.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f47f.bin
f2507c280f7c30f3bddd9c4bdd6057df355649e27f9748ba1b2ac3139c4695ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47F 5592 bytes
font_01_sfnt_off0001074f.bin
358f508e336ed1482d4dd0d92f92e432a0d26b964e539f603ecbddac1cff0b6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 10948 bytes
font_02_sfnt_off00012d14.bin
d53fd2dbb7526bb76b6d16ba26cd55c71edee9b473cd207bef3b0f8b6002a83a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 6300 bytes

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