Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5c7eaddb4d8667…

MALICIOUS

PDF

74.1 KB Created: 2020-11-20 06:35:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: d18568d5b812422b0af6bb052f2da719 SHA-1: 1d0f043d153fa6a1260c20a15c61635dad8d714a SHA-256: 1f5c7eaddb4d8667381841b17b8022c27d7d7872d669b35f015d59b676408211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm and ClamAV detection as a phishing trojan. The presence of numerous external URLs, one of which is marked as malicious, indicates an attempt to redirect the user to a harmful site. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL findings suggest a malicious document designed to lead users to malicious content.

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://traffnew.ru/123?utm_term=malevolent+gladiator%2527s+scaled+armor+vendor PDF link annotation
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/lojiweguwine_volezedobepivom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417824/normal_5fa25ca8e7f52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384048/normal_5f911de744c79.pdfIn PDF document text
    • https://giwirakixa.weebly.com/uploads/1/3/3/9/133999144/2867150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403417/normal_5fa0edcb60a8e.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.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/kevava/23751293663.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/koduvijogepaxixe.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/roblox_beyblade_rebirth_codes_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/55362326600.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/27026629892.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/potage_le_magnifique_skyrim.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/41403934370.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/osrs_1-99_smithing_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/paluluj.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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 5360 bytes
SHA-256: 24f3fa63acd149c404fbead95d6fe53641a3515d5c6ecaaa835f243e636be747
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 9980 bytes
SHA-256: dec5b26790c33f7306f472c0f70bdefb642f5f0b65a607e3ef3000ac05a00fd0

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