Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16d786ac510fb90…

MALICIOUS

PDF

70.4 KB Created: 2021-02-27 04:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ad50dcab07329d69c35761a4cfa2ea46 SHA-1: a31794616a33f3d4fb98bb416396124840bddbc1 SHA-256: c16d786ac510fb90a576dbf2d4e54f11d423a9bb9c085f5bd20a820a1c589ec1
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL and several others point to PDF files, likely serving as lures for downloading applications or other content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/wix?keyword=all+in+one+downloader+apk+free+download+for+android PDF link annotation
    • http://fobativ.mywebcommunity.org/zixoxupizuseperegoj.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/gdBNPTV/xinajikuratorisomaxadu.pdfIn PDF document text
    • http://golepikoxeware.22web.org/aosp_android_pie_rom.pdfIn PDF document text
    • http://kenufapozij.22web.org/vidmate_for_windows_8._1.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/ajRjdgi/nubiporalewaxexuxum.pdfIn PDF document text
    • https://gusefokujugox.weebly.com/uploads/1/3/4/0/134040973/tewatopogelipig.pdfIn PDF document text
    • https://cdn.sqhk.co/vadetegubufo/gh4yZ50/orthodontist_assistant_salary_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495994/normal_5ffabb332c3eb.pdfIn PDF document text
    • http://osthondroz.com/kafenibufipidegororifussq7z.pdfIn PDF document text
    • http://numulul.mygamesonline.org/skyrim_xbox_one_mod_load_order_list.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/jiifH2V/happy_jump_phone_game.pdfIn PDF document text
    • http://phtech.site/wixonakoxivatapegimb8vh0.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/ghcMyhe/zikuwo.pdfIn PDF document text
    • http://quickstore.pro/rarebuputekotapamaj9xl8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorisenunajix.myartsonline.com/67812743645.pdfIn PDF document text
    • http://dovixuti.rf.gd/carta_the_magus_tarot.pdfIn PDF document text
    • http://vapelokalun.epizy.com/waves_sound_effect_free.pdfIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/how_to_set_up_xfinity_cable_box_2020.pdfIn PDF document text
    • https://play.google.com/store/apps/details?id=com.fIn 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_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 5004 bytes
SHA-256: e0d570288ccafbf4dac18c738b1f1957b924f11477fa9f5ef535ecc647c511c8
font_01_sfnt_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 10320 bytes
SHA-256: 51eca1e86a60e1d05b62dbbf39ef4ce70efdc46852473254f3897933d187c499

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