Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da8b2aa0493a466…

MALICIOUS

PDF

83.6 KB Created: 2021-03-29 02:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: db0b4898a57273343dc107e64c1f4d87 SHA-1: 1b57a09c575fd2afe17ba7f155921a7d67e5175c SHA-256: 1da8b2aa0493a4662eb16c464e428794e12e53afcb54a2323103ed7ab81ae97d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a significant number of external links, many pointing to disposable hosting, indicating a link farm strategy likely designed to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to 'complete laboratory apparatus pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://soxebez.ru/123?utm_term=complete+laboratory+apparatus+pdf PDF link annotation
    • https://cdn.sqhk.co/mukutosi/mghcjZi/95890641518.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefaxeker/c8sJMZn/fisumesorelepegarafaxo.pdfIn PDF document text
    • http://flathead.us/sharkrf_openspot_3_review7chif.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/hhhgiaG/surface_area_of_a_rectangular_prism_formula_units.pdfIn PDF document text
    • http://ndfnasg.xyz/70136886296lpb6u.pdfIn PDF document text
    • https://cdn.sqhk.co/wapevenupu/fhghdie/pejebum.pdfIn PDF document text
    • https://cdn.sqhk.co/nemizuxe/fppfL5U/tap_tap_fist_coupon_code.pdfIn PDF document text
    • http://sallely.xyz/norton_anthology_of_english_literature_10th_editionsvuif.pdfIn PDF document text
    • https://cdn.sqhk.co/golomamone/51jaRew/misabedawol.pdfIn PDF document text
    • http://parhelifrl.space/sony_mdr-_100abnu7u1n.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/gezetega/boundary_layer_flow_over_a_stretching_sheet.pdfIn PDF document text
    • https://59b17237-83b3-47c6-9d40-f547da5b0434.filesusr.com/ugd/827194_66c91a0beeb844a4a9d1da0f459c8da8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/cadiz_city_map.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/kamijozimeduxasawevejo.pdfIn PDF document text
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_2814e84063d84421ba80da54a39d832e.pdf?index=trueIn PDF document text
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_124c8be9ee7d4cb3b9807436c3b40946.pdf?index=trueIn 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_off0000fb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB53 5180 bytes
SHA-256: fdc9c8ecdc2115d410c8091c862e424fcaf5a20df1c23f2e0850293c2eb5fb8e
font_01_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 11484 bytes
SHA-256: 1ccff0f9e5fc7e3150139829933b38c58b5c1d7a2d022125bf0a9e4b52ca47de
font_02_sfnt_off00013361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13361 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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