Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab54dbdb8120a81…

MALICIOUS

PDF

75.1 KB Created: 2021-01-25 12:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 72f157f2da019d9fa7aa24a24e504b26 SHA-1: 10ab007100b59773951d095a8e5853c7e7089620 SHA-256: 3ab54dbdb8120a81992191b52ec2c0af0d4d0c78084417624714ee32bec30967
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

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 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://leonvi.ru/123?utm_term=florida+unschoolers+gardiner PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4421776/normal_5fed07a4e08e5.pdfIn PDF document text
    • https://dekomowunine.weebly.com/uploads/1/3/4/6/134638227/7077426.pdfIn PDF document text
    • http://copyrightnotice-ig.com/69729244093yq75f.pdfIn PDF document text
    • http://gojepifega.22web.org/asfixia_mecanica.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5ff140fea9b4d.pdfIn PDF document text
    • http://bbflowers.net/eggplant_caponata_giadayz860.pdfIn PDF document text
    • http://sefajoga.iblogger.org/av_malformation_treatment.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/wemara_sobumuvigu.pdfIn PDF document text
    • https://senakubedezozi.weebly.com/uploads/1/3/1/6/131606366/zaporenetu-pidine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5fdeeaba119c4.pdfIn PDF document text
    • http://conicppjry.bid/lebujimerozobibakorujexewe9ht.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/nijudow/bass_boosted_tracks.pdfIn PDF document text
    • http://gavojomizam.epizy.com/54741085908.pdfIn PDF document text
    • http://wuzisop.epizy.com/21914372615.pdfIn PDF document text
    • http://lugimes.epizy.com/flower_garden_images.pdfIn PDF document text
    • http://gukupexokopiwug.epizy.com/wewuvasisosafuvopabiziwis.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/jonenusofanebusumimaja.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/python_3._7_3_free_64_bit.pdfIn PDF document text
    • http://notijopozij.epizy.com/degefib.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_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 5156 bytes
SHA-256: 1578fc46e826da96c1dda0ba4cf6bc2d8857c128d9512347122ca8d6e156e2b5
font_01_sfnt_off0000fb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB04 10844 bytes
SHA-256: 1c3341448d450cd7eaefb4e28c398b56c4dccc19729873ee12fa968bbfb8daff

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