Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6fa3245cdedd7a…

MALICIOUS

PDF

66.2 KB Created: 2020-12-18 03:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 5c4f357e418f1c7914cb46aecbfe94b7 SHA-1: c369e356a2bd14c3080bd3a1d0809c4672a4961d SHA-256: fb6fa3245cdedd7a0d2c86ec665e90cf44e951625b3097c4094ab1f444e92fa3
214 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to known malicious infrastructure, specifically a URL associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to job descriptions, likely intended to trick users into clicking the malicious link.

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/123?utm_term=career+guidance+counselor+job+description In PDF document text
    • https://vuzirokisex.weebly.com/uploads/1/3/4/5/134576988/e13bb5b7cbdd.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/752275.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/leguvefu/25786099591.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6a0bbf7cf8c754052888c/t/5fcbaea39cf56e0e8b16dc62/1607184036908/melodyne_autotune_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe08b29ee0f32b871abcca/1606289587809/52729250195.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/aho_girl_episode_11_sub_indo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5b1b8239b07229151fec3/t/5fc65ab05147b148040bae49/1606834865876/votajozitogobotofawifod.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57c39a3bf4b14abc81ab8/t/5fc7253e3d56556d1437c6cd/1606886719960/60938972027.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf54d29d79364840850a7e/1606374615005/874636875.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc14d4c5bcb0228a2853727/t/5fc6ad8a173fb5383b9091d8/1606856074440/nba_schedule_live_score.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf14c2edfcd2bda90684e/1606218060641/half_moon_bay_high_school_bell_schedule.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_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 5360 bytes
SHA-256: 1d518e03c912da493606463d4a13378a5a286cfdde83e0d747b21ef4af9071cb
font_01_sfnt_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 10064 bytes
SHA-256: 59a7da6bb64dd4d850d3f6aaf5a90d538a45938ecaba5c1e631a43ac8d5e43ca

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