Malicious PDF — malware analysis report

Static analysis result for SHA-256 304d7e7fb5c4a4b8…

MALICIOUS

PDF

74.4 KB Created: 2021-02-16 09:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 774ae3ccca5bf023bc8dbc3c4d9d3dbf SHA-1: 4332021098b4737b2daa230c37c42bb10d89465a SHA-256: 304d7e7fb5c4a4b857faaf9965e4aef46895e7bba46184bf629b214f6946b50f
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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://druttle.ru/wix?keyword=nsna+convention+2020 PDF link annotation
    • http://zoomita.space/remazugz6kep.pdfIn PDF document text
    • https://suzexefovewav.weebly.com/uploads/1/3/4/6/134640410/80290b3cf.pdfIn PDF document text
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/7390932.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/hc0iaMr/basurazirewezefafol.pdfIn PDF document text
    • http://korecos.ru/cervical_rib_exerciseszlqlz.pdfIn PDF document text
    • http://xiviwuk.iblogger.org/kukawuxupik.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/Xiiijgi/31323271430.pdfIn PDF document text
    • http://zagavuxowipoj.22web.org/uniformity_meaning_in_marathi.pdfIn PDF document text
    • http://roskycnmx.com/ismail_adgzel_tarihin_pusulas_201zoh91.pdfIn PDF document text
    • http://podjem2.club/mass_communication_living_in_a_media_world_7th_editionhditp.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/jfgfLz1/smeet_clicker_idle_clicker_game.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/h3zySxY/i_wish_you_were_here_lyrics_avril.pdfIn PDF document text
    • https://cdn.sqhk.co/libibajuzumu/IK1ifji/50212329430.pdfIn PDF document text
    • https://julubagarod.weebly.com/uploads/1/3/2/6/132695517/2875e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tugujaxozulir.rf.gd/58634637887.pdfIn PDF document text
    • http://faduguxilanapeg.epizy.com/71118496882.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_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 4968 bytes
SHA-256: f5a4d9eacf8f5e5a98ee48702d108cbea534ded26f17fc2b85a6450ee7fc623d
font_01_sfnt_off0000f8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CB 10768 bytes
SHA-256: d3cbe309de51ebe2cfe1b530ee052f7dc967602d063af0ec45b9ced7ee455f9b

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