Malicious PDF — malware analysis report

Static analysis result for SHA-256 412b5e81d350af8a…

MALICIOUS

PDF

76.6 KB Created: 2021-03-27 17:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ce81f2b8f646115df0d2534b14a4597c SHA-1: c7fc57e408c4717867308703faf204e20863b940 SHA-256: 412b5e81d350af8aae285eb169ca45573e252ab6426bd3bb80471a90443f4ee3
206 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to external sites. The document body, though partially corrupted, suggests a lure related to 'phonetic english dictionary pdf'. The presence of numerous external URIs, including a link farm on disposable hosting, indicates a probable attempt to drive traffic for SEO manipulation or to host phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://bologen.ru/award?keyword=phonetic+english+dictionary+pdf PDF link annotation
    • https://tuxonojetivap.weebly.com/uploads/1/3/4/4/134437157/9036074.pdfIn PDF document text
    • https://cdn.sqhk.co/gorigaserata/Epgehi1/lucky_block_mod_for_minecraft_pe_1._16.pdfIn PDF document text
    • https://xadamunakufadi.weebly.com/uploads/1/3/3/9/133986396/pakexotojisowo.pdfIn PDF document text
    • https://xinagaxigivawiv.weebly.com/uploads/1/3/0/7/130739766/vipedamadodapajuwija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386622/normal_6040fe33cd80c.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/yWGT5gj/converter_ico_to_jpg.pdfIn PDF document text
    • https://segapokepex.weebly.com/uploads/1/3/4/6/134649200/naposepopubelegitudu.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/QhidhjF/24064272935.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/bram_stokers_dracula_1992_movie_clips.pdfIn PDF document text
    • https://zubikuzo.weebly.com/uploads/1/3/1/4/131453486/nowiguvof.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/80xRJjg/pocket_knife_brands_made_in_usa.pdfIn PDF document text
    • https://cdn.sqhk.co/konumapedowe/Vhiphcw/40602327007.pdfIn PDF document text
    • http://tagaporigowekis.mygamesonline.org/60149768733.pdfIn PDF document text
    • http://juvovagesubo.mywebcommunity.org/68494666963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_6031b403a18cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_5fd8847dc2261.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/17672805164.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/munolatopemo_lozubarivi_jujipabakulid_nakanofo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_34a53e52ec854789be62ea77e544900c.pdf?index=trueIn PDF document text
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_6c78c795b5d84b11b0d654820433fa60.pdf?index=trueIn 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_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 5520 bytes
SHA-256: 2fc946dd86f72092ca15111b275983bb5cc8b8b0fa18a96817534652f2823d97
font_01_sfnt_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 12036 bytes
SHA-256: 2581fa627e0728d5d52a23d67421966b27b65cdfa13b652cb4b42e6ebe9d9e93