Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce70b8d32d1d2b1c…

MALICIOUS

PDF

85.3 KB Created: 2021-01-11 14:14:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c33109952b00e18ff7d70d6cb77fcd52 SHA-1: ead73236752269f9b57a1351f941e12489bf2047 SHA-256: ce70b8d32d1d2b1c5ab68d45e2458c113e5ac4decefc27daeaca6b91954645d2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

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://traffking.ru/aws?utm_term=balance+sheet+template+nz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5f9a77402f226.pdfIn PDF document text
    • https://nozoporunetub.weebly.com/uploads/1/3/0/8/130814805/d0f8c6969f86abd.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/fih97ii/game_sea_monster_city_hack.pdfIn PDF document text
    • https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/rofupukuretaga.pdfIn PDF document text
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/3926278.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/mafenizokirotu.pdfIn PDF document text
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/626cb0.pdfIn PDF document text
    • https://julalawigito.weebly.com/uploads/1/3/4/8/134869680/adbf3e52e4b8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fc8d14b41d33.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/dovulavavo/tonazatokowovol.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/jilugene.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/love_songs_guitar_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/31429003021.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_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 5176 bytes
SHA-256: 319692fc6126eb23efbcf2112e48f2f4fd46a7935749934976255ebd89332903
font_01_sfnt_off0001230a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230A 10928 bytes
SHA-256: 5ee9902828f2ed3bdab42533c1504db4e3d4d14e9592df4ee1dce0387fe3a6b4

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