Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0342d782e6a20a2…

MALICIOUS

PDF

74.4 KB Created: 2020-12-28 07:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 02404be010b57b04bd4527c2bd0f95db SHA-1: b5b4c03afe2921ce3745492440cfd6a9a65a6244 SHA-256: b0342d782e6a20a255e0b297271c08d6ace10e1bc9450b25639fbe9d94d46039
252 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the embedded URLs and link farm nature are strong indicators of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/123?utm_term=psychology+10th+edition+myers+study+guide In PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/digapesifu.pdfIn PDF document text
    • https://nagafibujur.weebly.com/uploads/1/3/4/5/134514283/zidilasekarunufi.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/crTO3gg/du_application_fee_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_5fcb2db74b962.pdfIn PDF document text
    • https://zedevemekorux.weebly.com/uploads/1/3/4/7/134748521/f1e431f1034.pdfIn PDF document text
    • https://loxeramulerizal.weebly.com/uploads/1/3/4/4/134476298/4075628.pdfIn PDF document text
    • https://cdn.sqhk.co/disovaje/ergdHF7/fashion_city_2_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/cjX3Yic/college_football_championship_2020_events.pdfIn PDF document text
    • https://xegabazoku.weebly.com/uploads/1/3/4/3/134318522/8284935.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59e20ed-9096-4a3e-991c-c9d026a7e396/paxixul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3752e90-5988-4ecd-b0d1-d6db7e7a7273/4456100463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b20ef3a7-31a4-4ea0-b46a-c44ffe46ab97/rowazejofap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb7ba018-6919-493e-9fd4-848d5e8cfcaa/distance_midpoint_and_slope_practice_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/113a3dd5-0564-4420-ad47-8006e203c373/57021876056.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 5440 bytes
SHA-256: 958e778e19f9ec659614a338e2e7e01787b78aba3f1fad697f012e25a82f275b
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 10660 bytes
SHA-256: 52e30db94da24c9f8fbd1b955910a7d8c685a08275bdedb88eadb46640c95479

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