Malicious PDF — malware analysis report

Static analysis result for SHA-256 253f1686de92930c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-29 09:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b67303211b2e267c0f684de6dc366d2 SHA-1: d5e5588abbfe79e6e256d0be9b38e6ad9ba29329 SHA-256: 253f1686de92930c2f5cef48d3e183d8b28b71f4c3bdd6d3c9520cba5bd5ed3a
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm designed to host malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs suggests an attempt to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=bwv+578+pdf
    • http://hookup666.site/kudexorict9ah.pdf
    • https://mawakizuk.weebly.com/uploads/1/3/0/7/130775730/rimokuwunudomavob.pdf
    • https://mivagori.weebly.com/uploads/1/3/5/3/135318233/velub_jujavinidogon_xofowi.pdf
    • http://mists.space/11517928536z1iq6.pdf
    • http://dkblogin-de.com/99005685126gc1ty.pdf
    • https://static.s123-cdn-static.com/uploads/4374976/normal_6003719926d7e.pdf
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/22990.pdf
    • https://kepubewi.weebly.com/uploads/1/3/6/0/136095452/novolewagew.pdf
    • http://torchland.xyz/school_uniforms_south_county_dublinu283h.pdf
    • http://mini-cam-v2.club/charles_law_problems_with_answerszxi9h.pdf
    • https://detudonerud.weebly.com/uploads/1/3/4/6/134660859/2241282.pdf
    • https://gabusuve.weebly.com/uploads/1/3/5/2/135297202/zasomulofiruw.pdf
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fc8311b88328.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fefadipif.rf.gd/fevadusexam.pdf
    • https://s3.amazonaws.com/rimejiguvif/learn_android_app_development_reddit.pdf
    • https://s3.amazonaws.com/gavobawum/first_alert_smoke_and_carbon_monoxide_alarm_keeps_chirping.pdf
    • https://s3.amazonaws.com/tinivukedeta/91840808856.pdf
    • http://vabepevid.epizy.com/pengertian_populasi_dalam_biologi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d27f.bin
11fe7d06e1d67cee8f7a70a9967e2bacb9657dfb441bdc7d4d2f37780b116ab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD27F 5120 bytes
font_01_sfnt_off0000e431.bin
557f3128595620b694da620c6dea6b7492920b6f7e8d8735a9feb1a9f25d21ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE431 11048 bytes
font_02_sfnt_off00010a23.bin
75e56e6dc913dabd8b3c9cd5ea70025aeab0fff598b2ab24d9d660aeb9535195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 16184 bytes

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