Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ae4c899fbf1866…

MALICIOUS

PDF

77.4 KB Created: 2021-03-31 05:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f692638918fa08f3d86947ae31fa3812 SHA-1: 7dd53f553fb682a7f34ad662c9d3bb7c09343fc9 SHA-256: 27ae4c899fbf18662db4dd3f3f0e1b809ed7deb93ce6f4d94240358ce8be0a03
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, https://seumenha.ru/wix?keyword=download+gangstar+vegas+mod+apk+4.5.0i, suggests a lure to download an application, likely a game mod, which is a common tactic for malware distribution. The PDF also contains numerous other links to disposable hosting, characteristic of link farms used to obscure the true destination or spread malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://seumenha.ru/wix?keyword=download+gangstar+vegas+mod+apk+4.5.0i
    • https://cdn-cms.f-static.net/uploads/4466398/normal_6056d98a9bb52.pdf
    • https://tadilagene.weebly.com/uploads/1/3/1/3/131381422/muxulilipunef.pdf
    • https://cdn-cms.f-static.net/uploads/4368788/normal_6060db8971abc.pdf
    • https://jitotapo.weebly.com/uploads/1/3/5/3/135314003/tikofulofulasul_zubafep.pdf
    • http://jepewadagamer.scienceontheweb.net/fluval_206_filter_media_setup.pdf
    • http://zitupow.medianewsonline.com/angular_5_documentation_download.pdf
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/raxapikalafupemoj.pdf
    • http://lebizifijafaxim.medianewsonline.com/isabel_allende_books.pdf
    • https://cdn-cms.f-static.net/uploads/4409393/normal_5fd1c3944ee2b.pdf
    • https://cdn-cms.f-static.net/uploads/4488574/normal_602a845e95bd8.pdf
    • https://static.s123-cdn-static.com/uploads/4417045/normal_5fe17453218d3.pdf
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/tanoke.pdf
    • https://cdn.sqhk.co/sebazisop/7D2sicF/beard_straightener_target.pdf
    • https://cdn.sqhk.co/fapiwejagiz/p0haPdU/round_mirror_top_cake_stand.pdf
    • http://wamipigobabi.22web.org/sobafenubenojosux.pdf
    • https://pesowisigafu.weebly.com/uploads/1/3/0/7/130739627/ff235048c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jajuzasalikirut/1100407725.pdf
    • http://tofikelis.rf.gd/generac_7550_exl_engine_manual.pdf
    • http://kosejoviwo.epizy.com/20588206836.pdf
    • https://s3.amazonaws.com/didowugorokirug/ipcc_report_2019_indian_express.pdf
    • http://taguloxutenafol.myartsonline.com/mis_deseos_feliz_navidad_lyrics_michael_buble.pdf
    • http://kavejanunar.epizy.com/how_can_i_get_my_address_to_show_up_on_google_maps.pdf
    • http://xukokumo.myartsonline.com/wugikubatep.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_off0000ec7a.bin
d85842bb9daaab12299bddb8eb441fb0455cb79e8ba7f2885e35a2d14811815a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 5880 bytes
font_01_sfnt_off0001009e.bin
55da5cf562e1b44a61a39fb41748f6585ff0420671ea9f3867b703354ddd3648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 11756 bytes

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