Malicious PDF — malware analysis report

Static analysis result for SHA-256 737f1b78fc799f59…

MALICIOUS

PDF

74.9 KB Created: 2021-03-15 10:56:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6493f11f317c6792a9899ca0511251a5 SHA-1: 269b0bf3f712fcd0757c09a534c395e7f5e67c86 SHA-256: 737f1b78fc799f599c26505e9a25fd0a407d4c24bba5ba404a6a96332b23596f
156 Risk Score

Malware Insights

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

The PDF file, identified as malicious by ClamAV and an ML classifier, contains a significant number of external links, a common tactic for SEO poisoning or redirecting users to malicious content. One of the primary URLs, 'https://bologen.ru/strik?utm_term=requisitos+para+instalaci%25C3%25B3n+de+gas+domiciliario+en+santa+cruz', appears to be part of this link farm. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to exploit users through indirect means, possibly leading to further compromise.

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://bologen.ru/strik?utm_term=requisitos+para+instalaci%25C3%25B3n+de+gas+domiciliario+en+santa+cruz PDF link annotation
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/13cf3a86.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/how_do_i_track_a_usps_letter.pdfIn PDF document text
    • https://jajewivazag.weebly.com/uploads/1/3/4/4/134491582/5118379.pdfIn PDF document text
    • https://sovinupuni.weebly.com/uploads/1/3/4/7/134762808/4270441.pdfIn PDF document text
    • http://mawosatejojeka.sportsontheweb.net/40070700679.pdfIn PDF document text
    • https://jarowezib.weebly.com/uploads/1/3/0/8/130813985/1553745.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/mesixadelomomo/ditetu.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/17508194868.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/wedding_budget_google_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d094f9-d714-4825-b6fd-4709e3208a82/graco_snugride_30_snugride_30_lx.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/parliamentary_form_of_government_meaning_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc72d57-dff9-4b5f-b836-86dfa5d69133/ejercicios_agudas_llanas_y_esdrujulas_5_primaria.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/the_bluest_eyes_in_texas_lyrics_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/65838427555.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/bangalore_airport_departure_information.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/atlantica_online_class_guide.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_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 5712 bytes
SHA-256: 89cc3839ae80ddfcb77e2e954a3dea68d9b2d4cd1895f9d93a1739953df8865f
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 12348 bytes
SHA-256: f8f34ae6446e82c340239698ed304fceebcc0b3fce143f69a7751fecf9de9b3e

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