Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc00c2731290e49f…

MALICIOUS

PDF

95.1 KB Created: 2021-04-04 05:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b4df422bddcc19e0dc4d75f1bc13e08 SHA-1: b0ab4c67a526a8ae1caded6d71fdc4d71fea41da SHA-256: cc00c2731290e49f9be657a02f8b3c75ea9e83bd869dcd327d5a5e0431982f76
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, many of which are SEO-themed, suggesting an attempt to drive traffic to potentially malicious or spammy websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wix?keyword=dq+xi+costume+guide
    • http://gadivawiw.sportsontheweb.net/meridian_energy_pen_manual.pdf
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/saxutanu.pdf
    • http://nituzovido.getenjoyment.net/gejuwudamefobe.pdf
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/zezojogujaj.pdf
    • http://vigirorimikana.medianewsonline.com/vetonowukipirabiwivisovu.pdf
    • https://kikizesojumare.weebly.com/uploads/1/3/4/7/134718780/64926fefab.pdf
    • http://nitupewefo.iblogger.org/puxiriz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wudemexa.myartsonline.com/worx_electric_chainsaw_oil.pdf
    • https://uploads.strikinglycdn.com/files/3ff5c540-55d4-4d0e-a431-cda3b93b9923/basic_and_clinical_pharmacology_15th.pdf
    • https://uploads.strikinglycdn.com/files/e74647ec-0b04-45b8-816e-b8b0a2841b56/nebinafasud.pdf
    • https://uploads.strikinglycdn.com/files/b7582399-6d63-4f20-bc0d-67d2fc2e6411/magnetic_curtain_rods_for_door_sidelights.pdf
    • http://zaduzos.myartsonline.com/bell_s_theorem.pdf
    • https://uploads.strikinglycdn.com/files/74f00ee6-0184-47fd-bbfd-7778b4b8eeb9/67518973759.pdf
    • https://uploads.strikinglycdn.com/files/837f1aaa-aeeb-4807-b5cf-013d0e438532/webajepinekezu.pdf
    • https://uploads.strikinglycdn.com/files/279ca7c4-3607-4ac8-8420-ee0f53f3a1b1/how_to_use_brackets_in_punctuation.pdf
    • http://lurarapekakaka.atwebpages.com/sokorib.pdf
    • https://uploads.strikinglycdn.com/files/82f7487a-6daa-4fe9-bcf0-293f96911914/how_long_to_charge_a_wahl_beard_trimmer.pdf
    • https://uploads.strikinglycdn.com/files/6cc03337-b4c9-480d-aa54-56f05252b9a3/food_web_lesson_plan_grade_4.pdf
    • http://wixuvixur.rf.gd/bumetivurefowawix.pdf
    • http://vujijemu.atwebpages.com/kusanezisixuwofupofixavu.pdf
    • https://uploads.strikinglycdn.com/files/3e121cc9-a25d-40b2-9bd5-09a3d788b197/jagidirisizegap.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_off000139a7.bin
cec427c472f9b4dddd57c45430c0f453a26fe950aaaff08e13718a5ed73354b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139A7 5112 bytes
font_01_sfnt_off00014b02.bin
003228a2cbc2ac29c9c8991eaf7de5d4d12a0aaca9ef4e672d695a2cfa15312f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B02 10648 bytes

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