Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a27a8d75f30cd43…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 12:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 551773c28afa44d5db712273385627ba SHA-1: 1ecffcde8d0bf522a52e27784de652c41c5d5fa7 SHA-256: 0a27a8d75f30cd43eac9a5bdd7d23ace9964a078b2c09597d2552f85598ff163
134 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a malicious workflow. The presence of a download button lure further supports the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/wix?keyword=subway+surfers+sydney+hack+apk+download PDF link annotation
    • http://afracheat2.xyz/458037505409608l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492240/normal_60545349570de.pdfIn PDF document text
    • http://wuramegojuluz.mywebcommunity.org/47342433267.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/15690269697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473375/normal_60281b2e2e338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_6014fddb5be08.pdfIn PDF document text
    • http://talajifit.mywebcommunity.org/74473621416.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/biotecnologia_industrial_volume_2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425768/normal_5fcb0110de848.pdfIn PDF document text
    • http://dress-russia.ru/serenabosumanitotobeboratlzgj.pdfIn PDF document text
    • http://buwovavozu.getenjoyment.net/trx_beginner_workout_plan.pdfIn PDF document text
    • http://jirafka.space/samsung_front_loader_washer_drain_pump_replacement1ohhe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_602d6860ac3aa.pdfIn PDF document text
    • http://mini-cam1.club/buzukajenovw2rnv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384468/normal_602f61be7975e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5fd7fa133ba3c.pdfIn PDF document text
    • http://vashmaster.info/196964576984ridv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/334f344a-2c3b-460d-a8d5-f26c4cd6ab5d/which_is_the_best_whitening_cream_without_side_effects.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83714821-9311-4e7b-93fe-11772dacf939/how_to_use_duracell_power_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c85ddca5-2e93-4068-9e5a-86248858da0c/how_to_bypass_printer_low_ink_canon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072d0d96-e7b9-4c91-844a-032cd243d29e/34702410985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b5e78b-8aad-457a-a7ef-cdaa9354d476/bofipakaxojo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 5744 bytes
SHA-256: 768194a462942eb3724012ff4e9fce5549ec0f648e374f94a033e1e47856372d
font_01_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 10780 bytes
SHA-256: b266f26ddf45c5755e35c9373b46a85bf556d5460e65e41e5081369202ea75b1
font_02_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848