Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1312264e067119…

MALICIOUS

PDF

108.5 KB Created: 2021-02-04 06:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d1e66fbcd2e9f8c664a9a06555cab20e SHA-1: 511bcfd0b5fdbd21e4cf5da0334bd454e9d4a250 SHA-256: 7d1312264e067119eaf8828c0483e2e417abceccb87f60e69ec4654c5281a7f3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links and a heuristic firing for a 'mass external PDF link farm', indicating an attempt to redirect users to external websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a tactic of directing users to malicious content.

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=veronica+mars+books+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365655/normal_5fedd9d00e1c3.pdfIn PDF document text
    • https://zigapugulila.weebly.com/uploads/1/3/0/7/130776078/bafiniwubogori-watonetita-mugenu-wuwekewepovo.pdfIn PDF document text
    • https://vavujajakakef.weebly.com/uploads/1/3/0/7/130740385/vudomeredoxeke_baxeme_povetaxa_nilumaga.pdfIn PDF document text
    • https://vajunepiw.weebly.com/uploads/1/3/2/6/132681590/1dc9d55694aa.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/kibavutibeved/assassin_s_creed_unity_dead_kings_soundtrack.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/25804217051.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/booster_seat_guidelines_nj.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/microsoft_word_travel_checklist_template.pdfIn PDF document text
    • http://julatelowix.rf.gd/industrial_production_of_amylase.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/juritodaxawogisupogej.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/hill_climb_racing_2_car_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/plural_nouns_worksheets_for_3rd_grade.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_off00016c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C4F 5248 bytes
SHA-256: ea3c3484f51010968074c66906a87ca4bb0988e57c859709f5507b1b927d7764
font_01_sfnt_off00017e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E18 11488 bytes
SHA-256: cca6325bd7bb329abe1fa1afa98c3e5bd6b1646b56a37ad33fdb31fddc46f88b

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