Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b7954f095dca66…

MALICIOUS

PDF

86.3 KB Created: 2021-05-21 13:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32716fb1b3193710ae842802278c3e1d SHA-1: db9265ec5cd2e6adc031e179cc627308e116cab4 SHA-256: 64b7954f095dca669c080d5133865bdd0fc19b7a083f3c3fc5e3c19c787a3185
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to S3 buckets, which is characteristic of a link farm or SEO spam. One of the primary URLs, 'https://botokaw.ru/strik?utm_term=dominican+republic+resorts+all+inclusive+punta+cana', suggests a lure related to travel. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=dominican+republic+resorts+all+inclusive+punta+cana
    • https://fofonameg.weebly.com/uploads/1/3/4/5/134522304/579af13cec.pdf
    • https://momiretet.weebly.com/uploads/1/3/5/3/135345559/59057f5b09137.pdf
    • https://memelixuluxowi.weebly.com/uploads/1/3/5/9/135958522/gepoka.pdf
    • https://puwawegolawibot.weebly.com/uploads/1/3/2/6/132682739/8451231.pdf
    • https://puzelosepe.weebly.com/uploads/1/3/5/3/135317481/4581413.pdf
    • https://pilituxasi.weebly.com/uploads/1/3/4/6/134685590/790630.pdf
    • https://mabavelege.weebly.com/uploads/1/3/0/7/130775551/xudataxa-pumipemuxeke-zexogedim-liwepugixawalig.pdf
    • https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/zusamarakewu_refefol_jolidepesigug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rilexazejuzovep/zilefetore.pdf
    • https://s3.amazonaws.com/xoxaneral/43456819635.pdf
    • https://s3.amazonaws.com/suzujewa/zavibiniwugebukadelapix.pdf
    • https://s3.amazonaws.com/rilexazejuzovep/16350989184.pdf
    • https://s3.amazonaws.com/gosete/dovifopenetisakutixino.pdf
    • https://s3.amazonaws.com/mikibetiv/59304927341.pdf
    • https://s3.amazonaws.com/fewunadupop/water_normal_map_shader_unity.pdf
    • https://s3.amazonaws.com/lovetijif/44158825091.pdf
    • https://s3.amazonaws.com/wusigipufuvowix/bundamba_state_school_uniform.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/rewupafetegalotos.pdf
    • https://s3.amazonaws.com/wulagisi/pleco_chinese_dictionary_apk_full_version.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010348.bin
cbda41547a249afbd8cfc8f190e3aefe0c646dd7d9e8f1528edd8879ad01e649		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 5160 bytes
font_01_sfnt_off000114b3.bin
bed79379beff3182968fa6ccf509f560b3cc6881459bc06a2b9f4dc4400ecbe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114B3 11496 bytes
font_02_sfnt_off00013bca.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCA 4324 bytes

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