Malicious PDF — malware analysis report

Static analysis result for SHA-256 10903a21a15dd905…

MALICIOUS

PDF

74.2 KB Created: 2020-11-24 21:19:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f416c9edc0de64a7b75ef2b63ab1a974 SHA-1: 7fa278732f387426e01e4fd63aa61b53412f7ee6 SHA-256: 10903a21a15dd905d0a92ee866575086fd309f0936beeb83ba3a318225ac1ab7
214 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a movie trailer. The presence of numerous external PDF links further suggests a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=green+arrow+movie+trailer In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3532345.pdfIn PDF document text
    • https://degujipimisa.weebly.com/uploads/1/3/1/4/131453395/d72fbe95682429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f9720294b370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386595/normal_5fbc2ebbbbf01.pdfIn PDF document text
    • https://rojumiladikeju.weebly.com/uploads/1/3/4/3/134315163/kikirinosidi-sepoximefetu-jiwirufov-sinano.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/d3f72d96-7802-416d-9398-9108fa73d3cf/63632643675.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/convert_to_base64_encoded_string_java.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/why_did_the_rug_roll_up_around_his_girlfriend_math_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3a12d7-c563-4906-852b-bac688dfd700/wujolugiwom.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/panera_boxed_lunches.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/jusitazowijuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67e74496-4406-4cdb-b668-f4d6045ae77a/hellobc.com_road_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40ff3fa4-1be9-4a74-9db1-f5fb633b1ad2/95533181193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf94c91-fcd6-49d8-beb1-ddbc61e35399/57243559750.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_off0000e508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE508 4836 bytes
SHA-256: 39ea85f6940de8f36a55ccfa726f7f5ff70f41a6940e65a881733fd329ff60f8
font_01_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 11240 bytes
SHA-256: d8a0cf257e7c23ee33f13ca1975a7fd69b808f96380d6127feb2dbfe0430921e

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