Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1aea01f0e84642…

MALICIOUS

PDF

82.8 KB Created: 2021-03-22 15:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d74211978085129d6ff44a31e8a00bd3 SHA-1: 6ac5bf786f1b3012391c9cac6c854f353cceaced SHA-256: dc1aea01f0e84642f00267b828f21d557b6870037e5f04867db4d5315bb642c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://seumenha.ru/wix?keyword=white+pigeon+auto+parts, is flagged as an external URI. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/wix?keyword=white+pigeon+auto+parts
    • http://palikexifumalam.mywebcommunity.org/hotel_and_catering_management.pdf
    • http://pikufufunuti.scienceontheweb.net/48210117472.pdf
    • http://pofuxubilet.sportsontheweb.net/rivemejizovuzam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://magegefopo.atwebpages.com/vifewasawubovenoxeb.pdf
    • https://uploads.strikinglycdn.com/files/6d86d376-43eb-4bcf-83ff-5b6a3b2f3cb9/3_tipos_de_sistemas_operativos_que_existen.pdf
    • https://uploads.strikinglycdn.com/files/39c9b023-a593-4b1b-b4f6-e3044966af47/lirr_jamaica_to_ronkonkoma_stops.pdf
    • https://uploads.strikinglycdn.com/files/14ff0eef-3f82-4ffd-b2b8-4076be3d55c6/singer_2018_dimash.pdf
    • https://uploads.strikinglycdn.com/files/44ba49e5-9089-41f7-889c-a14389943ef9/65555821808.pdf
    • http://pizenusogusu.atwebpages.com/49347658294.pdf
    • http://padegijogul.atwebpages.com/adobe_reader_x_free_download.pdf
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_34ad4c4909d048eb996926d922149ace.pdf?index=true
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_03be0f80ef2f4949b79fc7258c095800.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de76b630-dcae-40dc-8fd4-4cf644c980e1/how_to_operate_cctv_control_room.pdf
    • https://a49ec80b-b4e3-4dac-84ed-d687b6aff6a5.filesusr.com/ugd/46d696_d13150c3323045a08bed558ed484c590.pdf?index=true
    • http://positajugopisu.myartsonline.com/retinoblastoma_genetics.pdf
    • https://uploads.strikinglycdn.com/files/072e4656-6359-4fdb-a2bd-885bb5afddac/what_is_computational_thinking_class_11.pdf
    • https://uploads.strikinglycdn.com/files/db9edd10-46e2-4478-9558-31608fd3f86c/vipibozejuloxonevijadi.pdf
    • https://uploads.strikinglycdn.com/files/36b9e088-8f6c-4d76-867b-383807cc2424/delixejimi.pdf
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_0b102e400da9410c91f0d0285091fa82.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e5aabd9a-ba5f-48fb-9ba8-9e6019b3638b/nancy_drew_season_2_episode_4_song.pdf
    • https://uploads.strikinglycdn.com/files/26093fec-cc61-416f-9128-1f891001ebb0/samsung_mini_split_error_code_e201.pdf
    • https://uploads.strikinglycdn.com/files/ab7b9e13-a927-4a0d-8699-a62a3ea5eda0/robert_graves_greek_myths.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_off0000f8fa.bin
7b016604e6315bbb0c9033398438eb99f8d4fde9cc7b7d7a480f0fe8e6fe1c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 4944 bytes
font_01_sfnt_off000109c9.bin
47366852ea2073bd735222ab476f4606aef7efcc8b0dbd554a3c76d342452177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 11148 bytes
font_02_sfnt_off00012fb3.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB3 4324 bytes

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