Malicious PDF — malware analysis report

Static analysis result for SHA-256 397520be721cdf07…

MALICIOUS

PDF

77.3 KB Created: 2021-05-24 23:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2fe425d1c642052135a6fb8a69e9974 SHA-1: 785648e38b1e9fea593ac7b0bd8486f521d31536 SHA-256: 397520be721cdf079fbc2ab21b9d2f3f1b3d46d7a8ed92008debab35f7d728bf
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to a suspicious domain ('mezovuduw.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting an attempt to manipulate search engine results or distribute malicious content broadly. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+connect+a+rca+soundbar+to+a+samsung+smart+tv
    • https://vepoxiwoja.weebly.com/uploads/1/3/1/1/131164136/5604781.pdf
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/lugajawetuf_tekomom_tumorekuge_sobovasop.pdf
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/5101456.pdf
    • https://xegokefizu.weebly.com/uploads/1/3/5/3/135323464/wesametude.pdf
    • https://jukikekiku.weebly.com/uploads/1/3/1/4/131453151/4423032.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jotizifime/jiwagudugelelozugidi.pdf
    • https://uploads.strikinglycdn.com/files/8a84a97a-5b22-428c-b1e7-14dbfb52262b/albert_camus_myth_of_sisyphus_analysis.pdf
    • https://uploads.strikinglycdn.com/files/323ddc5a-518d-40ef-8a4a-7105da5b2caa/gabuwulerififovaj.pdf
    • https://s3.amazonaws.com/jarirotexab/69322076620.pdf
    • https://s3.amazonaws.com/sowirutelevolur/crock_pot_pork_roast_cooking_time_per_pound.pdf
    • https://uploads.strikinglycdn.com/files/173fee15-eddf-4c9b-a089-3d0f5d990d9a/vatizezifelimu.pdf
    • https://s3.amazonaws.com/moduluzuxikari/39958054422.pdf
    • https://s3.amazonaws.com/jubiferekaka/19932462750.pdf
    • https://s3.amazonaws.com/xisefowu/20362649896.pdf
    • https://uploads.strikinglycdn.com/files/2c65694a-085d-4752-9f5b-43ba58a1672a/33903997225.pdf
    • https://s3.amazonaws.com/likerajatob/hey_jude_easy_piano_sheet.pdf
    • https://uploads.strikinglycdn.com/files/a23daacc-b40d-4be3-b3ae-a51c001a3a45/39623532843.pdf
    • https://s3.amazonaws.com/rejiner/sefuredodapus.pdf
    • https://uploads.strikinglycdn.com/files/c70fc08a-8622-4427-bf04-b1d45f5d6f13/14132782279.pdf
    • https://uploads.strikinglycdn.com/files/3cba5593-2351-45d3-8f32-f13f2ae39a65/springfield_vt_newspaper.pdf
    • https://s3.amazonaws.com/lewuli/idm_video_online_er_apk.pdf
    • https://uploads.strikinglycdn.com/files/f5b6468b-a000-4c47-b637-b245dc9b8114/how_strong_is_konoha_white_fang.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee15.bin
a990c1115c4ccf9b50ad71767a398cf877efa49e0ba553d7572a209533385620
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 5480 bytes
font_01_sfnt_off000100b7.bin
cbbabbf6f485dfe7814cdf2695e72b2ab16019c060cbbdac7f3ab7363656ec0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 10752 bytes