Malicious PDF — malware analysis report

Static analysis result for SHA-256 db85ff7d797f7bf4…

MALICIOUS

PDF

67.3 KB Created: 2021-01-22 04:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e3866648937b3507ed29d2c2fff55ac0 SHA-1: dac0d37204439e0a27b9f311a5057b59e52ad229 SHA-256: db85ff7d797f7bf44b622fa188b01e30c70d1cb143e51aa2ea4866b851ee628e
214 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, containing numerous external links, one of which points to a potentially malicious URL. No scripts were extracted, but the sheer volume of outbound links suggests an attempt to lure users to external, potentially harmful, sites.

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://traffine.ru/123?utm_term=the+works+toilet+bowl+cleaner+sds In PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/5877283.pdfIn PDF document text
    • https://nobaletakalesig.weebly.com/uploads/1/3/2/3/132302751/20b536149c2ea8.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/wiwisevazunoj.pdfIn PDF document text
    • https://fanejutasoja.weebly.com/uploads/1/3/5/3/135399707/repalexiwo_dokudofunu.pdfIn PDF document text
    • https://kumeboxisadinur.weebly.com/uploads/1/3/4/6/134684257/vexera_sirapegen.pdfIn PDF document text
    • https://biravozoso.weebly.com/uploads/1/3/4/4/134400929/1849039.pdfIn PDF document text
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/xevojumalevubaki.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/devuxuzejozam/puguzaz.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/vlookup_excel_2010_two_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/bugegelotolobef.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/begatojiwer.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/plural_nouns_worksheets_6th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/chinese_dragon_head_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/tenses_worksheets_for_grade_6_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/sony_cyber_shot_dsc-_h50_camera_manual.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_off0000bf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6E 5060 bytes
SHA-256: 1e410fafefcef22ebfd45f942be782515e07c59bddf9718695403b936c38f5ff
font_01_sfnt_off0000d0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A3 9828 bytes
SHA-256: f6d7c4b2be1ce650d6ed07dd02290f5ca366457cd84010b0adee4ca23e9b6256
font_02_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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