Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bd30896dedd318…

MALICIOUS

PDF

80.2 KB Created: 2021-04-09 23:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f5c334715ef2204a7473907cb523e06a SHA-1: d61be25a1274c4774c1558e095121b536b7ccc5c SHA-256: f1bd30896dedd3188743f1a2ef92a8b05bc924827446eb6ee133b3099bda4c15
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to potentially malicious content or phishing sites.

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://golowaki.ru/strik?utm_term=how+do+you+load+accu+chek+multiclix+lancets PDF link annotation
    • https://juwibaviwexufeb.weebly.com/uploads/1/3/0/7/130739975/63ef6.pdfIn PDF document text
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/24898793.pdfIn PDF document text
    • https://sitegevom.weebly.com/uploads/1/3/4/6/134664280/3859866.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d934ed86-632c-4751-b35b-4303166f997e.filesusr.com/ugd/be0f55_281d158201524922bd4da325ebc165e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifuto/97999896508.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/2539643275.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/dj_audio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/suliwo.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/3192989495.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/black_and_decker_12_cup_programmable_coffee_maker_auto_clean.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_334753f2b3044e4bb04ec879eeeec694.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/monutolu.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/80467518374.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/algebra_worksheets_ks3.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/tizobuzupomu.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/us_anthem_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b646de2c-0d20-4482-bbcf-da57ab6b063c/the_least_intrusive_figurative_technique_in_film_is_the.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7f7d22-2409-4599-b169-aaf3192202ad/how_big_are_ho_scale_figures.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 5368 bytes
SHA-256: 645b84ad6ac8efd6101839f33179086d65007a606c57f74966b546484b80abf2
font_01_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 10784 bytes
SHA-256: 8fe9dee70a203dac5814e05d5af32bfca3a888a2ea7470c012e315ba8ec4c2ec
font_02_sfnt_off00011e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E21 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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