Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44ad54f49df4e14…

MALICIOUS

PDF

77.5 KB Created: 2021-01-21 06:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c7df6477f13df2f9a8d5c99601b30b40 SHA-1: e754ea5cfc9900d4b00ff0c31d20985ec4fae8e5 SHA-256: d44ad54f49df4e14bc978cd4ebdcffb1448b80d3f4a709a905aedbccffaae3d2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other domains, indicative of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious content or phishing sites.

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://jacksth.ru/123?utm_term=identify+connector+types+and+associated+cables PDF link annotation
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/8849877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385859/normal_5f9b07e033be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f8aff08011ca.pdfIn PDF document text
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/kepifeboxa.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/tapexiw/turiwosu.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/zuzubokasebujetudobonoge.pdfIn PDF document text
    • http://fawituwiluke.epizy.com/wejuku.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/jetstream_live_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/88768058276.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/novevikoxudakijukodikefut.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/zixuvibepuxekiduvawevu.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/sunogurad.pdfIn PDF document text
    • http://regujivabi.rf.gd/mebuwojidubuledi.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/blend_and_segment_words_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/81345356630.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/attendance_tracker_template_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/22455898368.pdfIn PDF document text
    • http://jakipogiwezekam.rf.gd/avengers_endgame_english_subtitles_full_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/85269557744.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/leave_letter_format.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_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 5328 bytes
SHA-256: 5c4ee0f028e05ba5124f5571b3264f56b96a4f2254c5768cb3ed70787ef05477
font_01_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 11328 bytes
SHA-256: 8df455428d1175266f1487913ad7b9f600d4832f81c12cc4880e365dfcc55da4

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