Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04f70d51ce0d4c3…

MALICIOUS

PDF

103.5 KB Created: 2021-05-28 22:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9790d7f611ad4a2c4055379c1102629 SHA-1: f006b69d9247093e59030f16df677b4e2be5bb8f SHA-256: d04f70d51ce0d4c3d3d16086376892f3b4b4688208292071e8c5df63bc4a392f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One prominent URL, 'https://golowaki.ru/wb?keyword=ashtalakshmi%20stotram%20in%20tamil%20lyrics%20pdf', suggests a lure to a website disguised as a search result. The presence of ClamAV detection and ML classification further supports its malicious nature, likely for distributing further payloads or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://golowaki.ru/wb?keyword=ashtalakshmi%20stotram%20in%20tamil%20lyrics%20pdf
    • https://cdn-cms.f-static.net/uploads/4393508/normal_604fa35a750d3.pdf
    • https://static.s123-cdn-static.com/uploads/4422877/normal_5fe156edbe65b.pdf
    • https://static.s123-cdn-static.com/uploads/4407562/normal_5fdf57d5ca885.pdf
    • https://jojumevowe.weebly.com/uploads/1/3/4/3/134314985/5995068.pdf
    • https://cdn-cms.f-static.net/uploads/4402032/normal_603805d5e7b00.pdf
    • https://nizidisifa.weebly.com/uploads/1/3/4/5/134505067/c1db1685bb89.pdf
    • https://cdn-cms.f-static.net/uploads/4369331/normal_60170052754b2.pdf
    • https://cdn-cms.f-static.net/uploads/4370280/normal_6013b0eebe0a1.pdf
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5fdbecb32e486.pdf
    • https://cdn-cms.f-static.net/uploads/4447098/normal_6041602103edf.pdf
    • https://cdn-cms.f-static.net/uploads/4418399/normal_6047d2de18f3e.pdf
    • https://cdn-cms.f-static.net/uploads/4453344/normal_606e004cd00af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/96bd8d98-93d9-4c6c-923f-b4646fe92ac6/dozabup.pdf
    • https://uploads.strikinglycdn.com/files/2a1e745a-4705-4714-82ef-3d341a58e4fa/how_to_boot_into_windows_on_a_mac.pdf
    • https://uploads.strikinglycdn.com/files/8c0ce9c2-104c-43eb-9214-eefe64eabd53/can_u_take_your_permit_test_online.pdf
    • https://uploads.strikinglycdn.com/files/f82eeffb-1746-40c5-bc6a-7dff75b166ef/19597875967.pdf
    • https://uploads.strikinglycdn.com/files/7da177bb-2819-4476-9d52-58398423d9cf/the_royal_standard_of_england_buckinghamshire.pdf
    • https://uploads.strikinglycdn.com/files/f39400ab-1050-46ef-8b28-5a2e6082ee6c/sas_proc_sgplot_histogram_frequency.pdf
    • https://uploads.strikinglycdn.com/files/2661803a-574e-4638-aa89-161048e7bd49/el_lenguaje_secreto_de_tu_cuerpo_gratis.pdf
    • https://uploads.strikinglycdn.com/files/74d35656-9feb-4b00-854c-641146094e25/harbor_breeze_saratoga_fan_manual.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eca.bin
1939aa3432b962f42e3fcb28f93c619bf479ffb297ece43dc5a11d137d655f36
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 5552 bytes
font_01_sfnt_off0001218d.bin
ec0b55b53f0b8afe3e26cb1c95e9a3b5f2c2dd54362eafed3e0fd6d754c0aa9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1218D 28056 bytes
font_02_sfnt_off00015835.bin
857c82db9d219a29c2d6db99c7d9aa852e331492b5e687bab85405aa833afb90
pdf-font-stream PDF embedded font (sfnt) at offset 0x15835 12908 bytes
font_03_sfnt_off000180ca.bin
a0ef318c3b58f5792fdeca4980d71f9505aed5aa54c14b9a431eb78d84afbfde
pdf-font-stream PDF embedded font (sfnt) at offset 0x180CA 3268 bytes