Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8a944fb4c76bd2…

MALICIOUS

PDF

70.2 KB Created: 2021-01-14 22:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 23940136b6b46fa35692bc93dabba08b SHA-1: 7286b99525c3478f2500a14552979bcd8c273cb0 SHA-256: 9e8a944fb4c76bd2f747706cf0d5e98c4ef0c96954212e28b66883883f0ae8f2
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL, https://cctraff.ru/aws?utm_term=textbook+of+pathophysiology+by+harsh+mohan+pdf, is flagged as malicious. The document body is heavily obfuscated, but the presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=textbook+of+pathophysiology+by+harsh+mohan+pdf In PDF document text
    • https://cdn.sqhk.co/fodibaniwe/chijjgV/word_cookies_cheat_apple.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/3074146.pdfIn PDF document text
    • https://site-1181037.mozfiles.com/files/1181037/big_rig_tow_trucks_for_sale.pdfIn PDF document text
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/xutunetizoba.pdfIn PDF document text
    • https://site-1168239.mozfiles.com/files/1168239/best_boy_games_2019.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/fenatagazise/fundamentals_of_communication_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/3m_9100_overhead_projector_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/corpus_callosum_agenesis_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/35358464965.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/vazakukeganama.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/kivejoridaratiromoguteved.pdfIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/ashokan_farewell_lead_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/read_collide_2_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/mole_cerebriform_nevus.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FE 5568 bytes
SHA-256: 4b42bf3d56e096f316f755f0e088cbab78c7d3fc8b0896f0467ec26631c6fc08
font_01_sfnt_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 10824 bytes
SHA-256: 5ebb50b0b51aa0c5ff7014c13facf593101fe54ecdf51901ea6b1677ca5b6e95
font_02_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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