Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90dbe63269cb313…

MALICIOUS

PDF

80.5 KB Created: 2021-03-20 17:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 68707e574c8c8615bf674d46479c2bdd SHA-1: 302a5ee6d09ace5f5909b67a2e4fbc8039edf333 SHA-256: f90dbe63269cb313f3c2253eba5ccc98a52b62f56b62af8d9dfa8bdb75c08fdc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary external URL, 'https://baarspo.ru/strik?utm_term=arris+tm822a+firmware+update', is likely part of a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=arris+tm822a+firmware+update PDF link annotation
    • https://cdn.sqhk.co/bexuxoxabim/Pggjgfr/hero_xtreme_200r_image.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/jfjjihF/16327770451.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/ghjhugc/xarenufinuwajep.pdfIn PDF document text
    • https://cdn.sqhk.co/lajakukilo/Ghfgjgf/xeperudirejojarunub.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/gigcKgd/liberty_general_insurance_online_renewal.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/dUfhjgh/wakoxulumu.pdfIn PDF document text
    • http://fortuneo.biz/endocrine_system_worksheet_middle_schoolsx28z.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/ghjaie1/my_hero_academia_smash_tap_apkpure.pdfIn PDF document text
    • http://verification-help.business/baasha_movie_in_tamilyogih3mtm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_17c2e00ce0694b5399fb785ae17fe1db.pdf?index=trueIn PDF document text
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_b018c887f4174feab0439fd0c4399480.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52a24c16-a41e-4f3f-8a8f-29f14c774bd2/japemirobek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c37fcab0-739a-4ade-92e3-10da8dacfc10/how_much_of_wolf_on_wall_street_is_true.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f022613c-c297-4b2d-b469-f8d4d7352760/jam_plus_speaker_wont_connect_to_iphone.pdfIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_97b17f39b50c4cee9d157c6ad6f43b5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4597f8-5e9e-4c26-a9c4-3b5129aecb70/how_to_replace_cuisinart_water_filter.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_33915378f59844d29edb893aa1755804.pdf?index=trueIn PDF document text
    • https://6a8c3f3f-5248-4e80-80e0-4bf2c04f72bc.filesusr.com/ugd/8b2c09_a17ba2c5a55c4aa5973d9ebd2d8da53f.pdf?index=trueIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_c250393e2a664b3fbf34d9c676b779c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8bf14a-da60-4f80-81a9-23fe851a83cd/what_is_covid_19_risk_assessment.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_1fa3e741adee432abf10e9eeb24c26f3.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18D 5228 bytes
SHA-256: 020400b6c3ccb6937f144f3c613341ed568bfab109d51df24865ec33c92b7d9f
font_01_sfnt_off00010360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10360 10388 bytes
SHA-256: 5268b65d7303ac727babbd2d26814efbef3982579488dc7670b1ac40ec44302a
font_02_sfnt_off000126f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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