Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a62dbd4e4ac98b0…

MALICIOUS

PDF

70.6 KB Created: 2021-02-19 16:03:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3ecc7a611c74b4f40900759c1b8e1e4a SHA-1: 77a6b4d85a18a431862ff2a3e5a55547cea73852 SHA-256: 1a62dbd4e4ac98b09ccd9567b916b35ca4e1bcb3473c472ae16e56ff8a57319c
244 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, and contains numerous links to external websites. The document body, though heavily obfuscated, suggests a lure related to video game updates. The embedded URLs, such as 'https://yafferge.ru/strik?utm_term=how+to+update+patch+the+sims+4+on+ps4', indicate a phishing or redirection attempt to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+update+patch+the+sims+4+on+ps4 In PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/1605736.pdfIn PDF document text
    • http://sbrf.link/we_are_displaced_bookmnryl.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/jaY2jht/running_shoes_near_me_womens.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/ieBLjcO/suvoxuxulodagurikawomomi.pdfIn PDF document text
    • https://lipijubirenazob.weebly.com/uploads/1/3/4/7/134722159/madefinuke_sejirasu_lorilezekuve_xigatubejob.pdfIn PDF document text
    • https://cdn.sqhk.co/jupozaregu/gBvshdH/virus_the_game_adenoids.pdfIn PDF document text
    • https://nodirodenesubob.weebly.com/uploads/1/3/5/9/135986245/1b0de1.pdfIn PDF document text
    • http://bcpreactiva-enlinea.com/brighton_and_hove_buses_timetablepuczc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_60206061e7b42.pdfIn PDF document text
    • http://yachts-4-sale.com/zigevadabatevurxarh1.pdfIn PDF document text
    • https://fujulisu.weebly.com/uploads/1/3/4/0/134042697/fisozimixuzuf.pdfIn PDF document text
    • https://cdn.sqhk.co/ledivure/ibiggd6/39161003146.pdfIn PDF document text
    • https://cdn.sqhk.co/salasereki/YjffCid/birewefuwaxevoduvejem.pdfIn PDF document text
    • https://sifejolo.weebly.com/uploads/1/3/1/4/131410009/ritojadavabared.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5ff685c0b311a.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/napoledunadigo/bhakti_song_dj_bihar.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/87752072777.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/74954962708.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/aftermath_full_movie_in_english.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_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 5324 bytes
SHA-256: 1572b6bae140a768c90cf4968959d9c6f9f881ab4cdb1010345595f05dc47bce
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 10480 bytes
SHA-256: fc9dc6d1ed63f687335eb826c653bbbab115022274d45cd9fce31e34737d7d2a

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