Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8a3d3839d54daf…

MALICIOUS

PDF

83.6 KB Created: 2021-02-25 05:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 066da14aede96b0864ec41af4087ad7d SHA-1: a024ca92cb8bf122068e3547a125af3b05dbd78a SHA-256: 5f8a3d3839d54daf3ba1ac351598d93a92590576fcaf583a0ef52170d8d85ea1
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, yafferge.ru, which is designed to lead users to malicious content. The embedded content, though heavily obfuscated, suggests a phishing or malware distribution attempt by masquerading as a product search result. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/award?keyword=sony+str-dn1080+price+australia In PDF document text
    • https://cdn.sqhk.co/nobutowug/SIggjiU/jexavizobaxuku.pdfIn PDF document text
    • https://cdn.sqhk.co/zezerixuwab/ifygfje/spaceship_commander_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/ihijFSo/master_of_politics_and_public_policy_mq.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/fii3Kib/puxuxujiwomuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477181/normal_5fe66c7b87ace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_6036cffa18fde.pdfIn PDF document text
    • https://cdn.sqhk.co/sadudolamom/EicyLhd/miracle_play_literary_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/bidihGV/2645095370.pdfIn PDF document text
    • https://cdn.sqhk.co/tovisegag/ifUjeZU/39145154814.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/f2gjjsr/fipesasap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_602042aae3c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401559/normal_602bf424489c2.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/pjdMCmE/wifi_password_viewer_pro_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/Oihrus3/77190567405.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387701/normal_5fce8c68100c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_602d76067601b.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/y3nTHgc/change_video_call_background_teams.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/jeworurowam/fijaberisaruzarasilebu.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_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 5692 bytes
SHA-256: c5c7fb36984066fbe6d4558ab2da02f202d2a785533f081a92ed0c3aef7d70fe
font_01_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 11000 bytes
SHA-256: 4b4fec55fb7ae7027d0af6bb4690af81b676e52ff0c8fc4b8b0424c5b4620ac6

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