Malicious PDF — malware analysis report

Static analysis result for SHA-256 831826da24d55504…

MALICIOUS

PDF

67.1 KB Created: 2020-12-25 09:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 916d2f77807f975cd6e39f1c09781c87 SHA-1: d9de60cd2a35e1bb1c5b9633dfaafa02402b971e SHA-256: 831826da24d55504961ca15e5d0e75ad935ea55b7b5eb60b495cd04ffbc55d8b
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that redirects to a suspicious domain, likely intended to trick the user into visiting a malicious site. The document body, though truncated and obfuscated, appears to be a lure related to search terms, further supporting a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?utm_term=smoke+shops+in+vancouver+washington PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449421/normal_5fa8bf2908b52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500882/normal_5fcbc6101e8f9.pdfIn PDF document text
    • https://tozafutesaf.weebly.com/uploads/1/3/4/9/134900259/retadevetod.pdfIn PDF document text
    • https://fulafokowezoje.weebly.com/uploads/1/3/4/3/134384829/5920915.pdfIn PDF document text
    • https://getazaxebu.weebly.com/uploads/1/3/4/8/134866961/3586837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_5fd84dd0700e5.pdfIn PDF document text
    • https://junovolosexev.weebly.com/uploads/1/3/4/4/134467690/4328143.pdfIn PDF document text
    • https://divevuke.weebly.com/uploads/1/3/3/9/133999966/gezuzibakozi-tanuv.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/salosibejodod/53964004202.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/vevirovitizofefonemuvam.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/4838910547.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/florida_driver_license_handbook_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/53520793433.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/kipakikawafovomogovexirav.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_off0000c9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 5632 bytes
SHA-256: 566ad4a781c8a291b9598a469e9a1399a8638e050a0b0105d64f11b91aa86ed0
font_01_sfnt_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 10144 bytes
SHA-256: 67bcf38adcad521ebfaf7180e3615584303c4c1b886b093c110f1bbcf6c247b3

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