Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3511c79aa5f4fd…

MALICIOUS

PDF

66.1 KB Created: 2020-12-29 12:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0135efb68cbe854ce760786e473e1ec9 SHA-1: 7944c647565f3ded88f492732b9f53b2befde78c SHA-256: ca3511c79aa5f4fd47845683268605f71a4fba8eb04abe092c0bd234085f85fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a heuristic firing for a 'PDF_SEO_LINK_FARM', indicating it hosts a large number of external links, likely to malicious or phishing sites. The presence of an embedded URL and the ClamAV detection as 'Pdf.Phishing.Trojan' further support a malicious intent. The document body, though heavily obfuscated, contains a string that appears to be a lure for movie content, suggesting a phishing or malware distribution campaign.

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
  • 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.
  • 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://traffset.ru/strik?utm_term=nonton+fist+of+fury+donnie+yen+subtitle+indonesia PDF link annotation
    • https://molireju.weebly.com/uploads/1/3/4/6/134630509/9283328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5faaf002c9bc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422894/normal_5fcc52be4681c.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/pogodabex.pdfIn PDF document text
    • https://podesasi.weebly.com/uploads/1/3/1/4/131437149/tabiwej_zuzulasop_lufosuw_nexepax.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/jagux/aesculap_dental_instruments_catalog.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/26060007361.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/xekumizozo.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/10880800842.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/einstein_s_riddle_app_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e706ec8-1c90-4236-b792-79c133eba9e4/decimal_place_value_worksheets_common_core.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401aa80b-4292-4c7c-92b6-1b7704b1ee4b/ravel_bolero_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/870ca11e-4702-4c60-84c6-227e930f63a8/ucr_computer_science_ranking.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_off0000b340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB340 3720 bytes
SHA-256: dfcefab0975b6b1a8b70423b5c9b0907aac473498bf410a277dbeba4dd2ef09c
font_01_sfnt_off0000c072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC072 5112 bytes
SHA-256: 37128e5db57eb3b4933b208604ad500ef44d62649252c7637955496273451dbb
font_02_sfnt_off0000d1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EE 12936 bytes
SHA-256: c16484c324abb61849c9c8bfa9326d779668b5d36ab1fdb2484bb0711bfa0faa

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