Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb82be6fc755602d…

MALICIOUS

PDF

88.7 KB Created: 2021-04-08 02:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d10b67a325ae3acf8f8b505fd9414089 SHA-1: b7b920cd137526b62bf09a53b530c2325b54075d SHA-256: fb82be6fc755602d8ae75f4d494fd042c9cab6f74af4bd89fbe5c16fcc73a128
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO spam or phishing campaigns. ClamAV detected this file as 'Pdf.Phishing.Trojan', and a machine learning classifier also flagged it as malicious with high confidence. The embedded links likely lead to malicious websites designed to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=bed+threads+linen+sheets+review
    • http://prizinsta365.website/how_to_set_the_time_on_a_citizen_eco_drive_skyhawk_blue_angelsghmp9.pdf
    • https://cdn-cms.f-static.net/uploads/4392867/normal_602a47910143d.pdf
    • https://lalusaguru.weebly.com/uploads/1/3/4/6/134611329/6136936.pdf
    • http://bofesota.66ghz.com/86327099593.pdf
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/wugejupobuwak_vusavuj_komemomejam.pdf
    • http://pipvip.ru/66811018660qxoeh.pdf
    • https://static.s123-cdn-static.com/uploads/4370068/normal_600980e66da2e.pdf
    • http://gejekewawe.iblogger.org/tutoxisuzawujaz.pdf
    • http://demask.space/zajodunevidokagasqpu0.pdf
    • http://natur-bio.space/fikukuzegotozoqx8.pdf
    • https://lefasibemaji.weebly.com/uploads/1/3/4/5/134589759/sojowizifepe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3f0b5d6d-44b8-4d07-9833-a2c0e0f84374/how_many_lines_does_malcolm_have_in_macbeth.pdf
    • http://fofilelajisemap.rf.gd/90806433679.pdf
    • https://uploads.strikinglycdn.com/files/d27f8200-9ce4-4d84-a971-5e1aa65abb25/scott_mueller_upgrading_and_repairing_pcs_23rd_edition.pdf
    • https://uploads.strikinglycdn.com/files/c6f49ccd-9e78-42c1-9d38-77c819e90ee7/mulofipib.pdf
    • http://dimesagir.epizy.com/42340113794.pdf
    • https://uploads.strikinglycdn.com/files/5ec0f12e-126a-44b4-ba9b-6128bd148c62/toastmasters_pathways_general_evaluation_form.pdf
    • https://uploads.strikinglycdn.com/files/82ccea0e-f8d8-4ab4-bd6d-dddffd06520c/mefujipola.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_off00011ba5.bin
52df8d8b4546291081f1acab45d6f0fb33c6dfe6a88094d84884d7218615a116		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA5 5116 bytes
font_01_sfnt_off00012d18.bin
f48faab624bfadc7b242829b65a1778eb7c724c71a6aed94b57f7a115b3e8a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 11356 bytes

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