Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7fd8e44d0d8d1c…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 15:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bc700ba9d3cbcb3fc8c611a3e0da772e SHA-1: 23fb16a594880a113b5c15d77e081b56f58deed5 SHA-256: ae7fd8e44d0d8d1c30b3875081ca8b5d095d9f4c5c2754f02724b08abf601adf
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary malicious URL identified is https://gimoguvi.ru/strik, which is likely used to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=program+management+tools+examples PDF link annotation
    • http://kukushka.space/52735204638t8q3p.pdfIn PDF document text
    • https://xemivigezeb.weebly.com/uploads/1/3/4/4/134481563/nejamilikajarulove.pdfIn PDF document text
    • http://nosinoski.shop/gagunimomazizobumagabinatph9mi.pdfIn PDF document text
    • http://dopogabijup.mywebcommunity.org/23735638387.pdfIn PDF document text
    • https://bimozasobo.weebly.com/uploads/1/3/1/3/131398313/5273728.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://wipebodu.mypressonline.com/cardiac_rehabilitation_physical_therapy.pdfIn PDF document text
    • http://sovetnik53.ru/71536329680qu7z1.pdfIn PDF document text
    • https://rozozejowetape.weebly.com/uploads/1/3/4/5/134510424/9252604.pdfIn PDF document text
    • http://zonizubiro.getenjoyment.net/adda247_current_affairs_january_2020.pdfIn PDF document text
    • https://lakadepoti.weebly.com/uploads/1/3/5/3/135301691/671550a0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisijuvod.myartsonline.com/82820586821.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/al-_quran_digital_free_for_mac.pdfIn PDF document text
    • http://nepunefetonub.epizy.com/fofavo.pdfIn PDF document text
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_c13302dacfac4424ad8417faa118759f.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_515fddc076bc45679d70dcbf71721177.pdf?index=trueIn PDF document text
    • http://zaxalamel.rf.gd/90289277934.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/sixiza.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/blackbird_nina_simone_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/14066933409.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 5208 bytes
SHA-256: dceb369f71c91754576282f6387bd7ba2a6ec00dc637ff82b362546300a642e3
font_01_sfnt_off00010a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A68 10588 bytes
SHA-256: 26f97c0818b975c61b772982e5a565ac0619987b33cdaf4e869c680598599c5c

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