Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf037fdf8b83ca7…

MALICIOUS

PDF

74.3 KB Created: 2020-11-25 08:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5576531857381bebb4fd1ef611c2ebbd SHA-1: 228c0f9bbf06fa84c44160921c75e8180577f66b SHA-256: 0bf037fdf8b83ca71909c84f41965972a45e39be94bbe8f3a2ae49f2f9cef643
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that point to link farms, with a critical heuristic firing for malicious redirector links. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

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://traffmen.ru/strik?utm_term=betta+labyrinth+organ In PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/4389972.pdfIn PDF document text
    • https://merokiniperoj.weebly.com/uploads/1/3/4/6/134691049/sipamono-xuwenafirej-gitifeled.pdfIn PDF document text
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/7651178.pdfIn PDF document text
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/pejegutitefa.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/wajufifenoxuj/mabinogi_beginner_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/92804787558.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/intermediate_accounting_17th_edition_wiley.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/eoc_review_packet_math_1.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/34714269846.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/kinaz.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/junta_del_acuerdo_de_cartagena.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/domain_and_range_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/viwag.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/dead_rat_smell_killer.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/blank_cheque_images.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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 5060 bytes
SHA-256: bdaa93a92f163be374e7afe8677fdc386b253c81a6dc04ec50a191859a21b6a6
font_01_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 1716 bytes
SHA-256: 70b844f74996fcee5e1d27ce90af7085dab18ef8498285b96f5f41c426451930
font_02_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 10536 bytes
SHA-256: 6362b75a3b9184dd46c3fd56e4c94e3400d76f2c5eea8c383047fec62b530eb4

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