Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbfa5c737dac471…

MALICIOUS

PDF

90.2 KB Created: 2021-03-23 15:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3071f2a4e7cbac578e989f11a5d2c251 SHA-1: a92d94917ad851ac51d48385d4661babd3e47cc7 SHA-256: 2cbfa5c737dac471dfce15e61b418ce51120e5dd6f7bf2f52af27ea626f59cd1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, and detected by ClamAV as Pdf.Phishing.Trojan. The presence of numerous external links, many with numeric slugs, suggests a link farm or SEO spam tactic. The document body is heavily obfuscated and unreadable, but the embedded URLs point to suspicious domains, indicating a potential phishing or malware distribution attempt.

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://seumenha.ru/award?keyword=apache+cordova+tutorial+espa%25C3%25B1ol+pdf
    • http://zabemaladameg.medianewsonline.com/67720576301.pdf
    • http://nenodipemuxok.mypressonline.com/how_to_fix_a_ge_sensor_microwave.pdf
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fe0dec8b11ad.pdf
    • https://xitupiwe.weebly.com/uploads/1/3/4/4/134489196/1501962.pdf
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/gomux_zadok_xolorovinorilod_riwusejutapofa.pdf
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/7673e358329a812.pdf
    • http://mujudesuxiropa.sportsontheweb.net/zamanizorixunugu.pdf
    • https://cdn-cms.f-static.net/uploads/4383566/normal_602b991aa0490.pdf
    • https://cdn-cms.f-static.net/uploads/4450876/normal_5fd9227dc700d.pdf
    • http://ridaxaki.mywebcommunity.org/81151178942.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/mojivikapeti/saucony_guide_iso_womens_10.pdf
    • https://uploads.strikinglycdn.com/files/462e73da-47fe-4fbd-aa41-e9fa7d8e234c/breach_of_contract_lawyer_houston.pdf
    • https://uploads.strikinglycdn.com/files/86eda12c-8293-4fc1-a5f7-d29c408a5bda/how_to_pair_turtle_beach_stealth_600_to_xbox_series_x.pdf
    • https://uploads.strikinglycdn.com/files/e63ed097-1649-42b3-9f5e-47c06f2cd3d4/34407786384.pdf
    • http://jisijuvod.myartsonline.com/desabejevefulawuwag.pdf
    • https://uploads.strikinglycdn.com/files/69eddcf8-a7ef-41fe-9061-87be585570bf/york_diamond_90_furnace_parts_list.pdf
    • http://lukafimagog.atwebpages.com/94986987541.pdf
    • https://uploads.strikinglycdn.com/files/d265e39d-d235-470d-baf2-640d408315b5/why_has_my_tp_link_stopped_working.pdf
    • http://tulifal.onlinewebshop.net/11811572147.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111d9.bin
c4c2f224b9c709973419beb5f08069ee04ff7ad53b9b8a81bc15c441fcf98a12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 5280 bytes
font_01_sfnt_off000123bc.bin
7145c61a93b541ca3a4d35bb7b1bf8ed35d559c3d3ee470512845e1186143b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 11860 bytes
font_02_sfnt_off00014acd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACD 4324 bytes

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