Malicious PDF — malware analysis report

Static analysis result for SHA-256 61da7b8b0be1c445…

MALICIOUS

PDF

73.0 KB Created: 2020-12-24 17:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1c8ea38fb7a15f94bf3cec1326a36d04 SHA-1: 38d592a41fe1cfbfc8c829ecb67648b8e10e107e SHA-256: 61da7b8b0be1c4450a897aa7d39cbde27d5f7259c69d84df2cb7712e1e59e186
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to benign resources, but at least one suspicious URL (trafftec.ru) is present. The document body, though heavily obfuscated, suggests a lure related to a calendar template, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/aws?utm_term=blank+hourly+calendar+template PDF link annotation
    • https://cdn.sqhk.co/baxemazisod/Rjfiit7/zelugokolizokirifudara.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/fuzujat-kazupupodok-wused-kopajiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_5fbf1389c2fb2.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/tuzamada/england_world_cup_2018_team_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/vokofas.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/picsart_mod_app.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/agriculture_class_10_notes_meritnation.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/nagini_tamil_serial_yesterday_episode.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/vejotalifuxisekedumofa.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/sociologija_kulture.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/shadow_priest_pvp_guide.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_off0000e2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C1 5352 bytes
SHA-256: eda7b1206fc522a0ef15e683045575ddd7738e0f3c023e8479d1bf3e482a05ed
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 10068 bytes
SHA-256: 71d435adbbc1615709158c62fa13f9516146874c8c5188fee98007480875e150

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