Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23a2fc2d5efad59…

MALICIOUS

PDF

76.2 KB Created: 2021-02-25 13:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1a370044d9e015a666bf33eeddd3cb0e SHA-1: 1c22554382a653f4dfab7eb7aa4dbb9a16fb3b4c SHA-256: d23a2fc2d5efad596ecfabfe17f3a3ee30af9b11121bec42b3cebf0e401dae81
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful websites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/award?keyword=inateck+bcst-10+bluetooth+barcode+scanner+manual PDF link annotation
    • https://cdn.sqhk.co/nebafori/6dggji6/mujimexaruvoz.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/tabela_percentual_de_gordura.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/dhBjbhe/shark_ion_robot_r85_mapping.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/bjeyhe1/bottle_shooting_game_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/ejiWgdC/nogomuwafuxururuxuxu.pdfIn PDF document text
    • https://fanejutasoja.weebly.com/uploads/1/3/5/3/135399707/pafedu.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/jhNhieQ/61737296284.pdfIn PDF document text
    • https://ramasiwo.weebly.com/uploads/1/3/5/3/135390431/31f428ce01f.pdfIn PDF document text
    • http://mujumuvibofa.iblogger.org/2723541039.pdfIn PDF document text
    • https://xulozajewe.weebly.com/uploads/1/3/1/3/131384688/jobabaxobalediwonofa.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/remilela-daluzis.pdfIn PDF document text
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/zetib.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/rainbow_fish_download.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hiijgw2/49528645235.pdfIn PDF document text
    • http://dajexori.mypressonline.com/safety_measures_in_construction_site.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/fGf6gxU/wolf_wallpaper_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nununad.myartsonline.com/tissot_t_touch_connect_solar_release_date.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/stacked_bar_chart_worksheet.pdfIn PDF document text
    • http://vawekud.epizy.com/99205118337.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/lotawezisalukozitimunik.pdfIn PDF document text
    • http://widopux.epizy.com/gasivipajow.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_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 5544 bytes
SHA-256: 2b24b9a8d6998fa36b84c6d84637d1c6aad03a88722abb9eb190c774a413724d
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 10308 bytes
SHA-256: 25397a182a5a9e9ce0ae366ea0b07b1969266d0293df871d0301c7e5186052a3

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