Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78cb444cdb4e23e…

MALICIOUS

PDF

75.0 KB Created: 2021-03-24 22:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9f000d669e9d84f1fdd3e43d4fdec30 SHA-1: 20ac4edbb4d1e720c851f8278570016fefdee2f6 SHA-256: f78cb444cdb4e23e0942d1976e7a7509fec19a9fdbac3e80c89bb6f6de993e0c
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a notable heuristic identifying it as a 'PDF SEO Link Farm' and 'Image lure linking to an SEO redirector (free-download phishing)'. The primary malicious URL identified is https://maypoin.ru/123?utm_term=weber+grilling+guide+rib+eye+steak, which appears to be part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/123?utm_term=weber+grilling+guide+rib+eye+steak PDF link annotation
    • http://kigumelez.medianewsonline.com/advanced_dungeons_and_dragons_adventure_modules.pdfIn PDF document text
    • http://mihetos.xyz/9252929888507ffr.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/66221285093.pdfIn PDF document text
    • http://trycabinets.xyz/5508092051344bt.pdfIn PDF document text
    • http://pedron.fun/rixediwetimawuemigq.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/vofadoloves/simple_predicate_and_complete_predicate_worksheets.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_e7fd9748e8754056bc08332f55ba173e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/taturi/modern_world_history_patterns_of_interaction_textbook.pdfIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_e156b53b48b344fba056b3d43efa2d14.pdf?index=trueIn PDF document text
    • http://dimuwebogikufuf.rf.gd/86610563872.pdfIn PDF document text
    • http://valupakukav.myartsonline.com/89141548080.pdfIn PDF document text
    • https://18282f24-d4e3-4c19-b4d9-8e3fdaa82145.filesusr.com/ugd/df2b7b_d514899cbb8e4939bb9d98fc054cc357.pdf?index=trueIn PDF document text
    • http://wokamanegiwive.rf.gd/anabolismo_de_los_carbohidratos.pdfIn PDF document text
    • http://joxugodeluda.rf.gd/3588026942.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/basic_epidemiology_and_biostatistics.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/8276424247.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/xaxitejijebebeder.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/how_atoms_are_held_together.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/financial_reporting_council_of_nigeria.pdfIn PDF document text
    • http://popasewunagen.epizy.com/how_to_sew_a_cover_for_kitchenaid_mixer.pdfIn PDF document text
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_097b45ea8f14472b8a4ed941b82efb54.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/zifaxixow.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_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 5312 bytes
SHA-256: b21e5c17f4f85505fd8d16aeee5c594aabfff9d27234a79e3b6c96bdb042d252
font_01_sfnt_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 10904 bytes
SHA-256: 22b4087ef5692bbde21dbfcc2ec2542037771eefc1c565320a1f39e64f9b610a

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