Malicious PDF — malware analysis report

Static analysis result for SHA-256 4773a9b358316187…

MALICIOUS

PDF

104.2 KB Created: 2021-03-02 10:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f78fe39120b1d8e47fff4e6be3edc4a8 SHA-1: f6cf2df9a7fc962a2a87460f733ad42fda5d4fe0 SHA-256: 4773a9b358316187eb61bfcf0f7b9b030e807d95139bd48008d30e34d38fb58b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to educational content, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/wb?keyword=dividing%20mixed%20fractions%20word%20problems%206th%20grade PDF link annotation
    • http://vataponuxizeliz.mywebcommunity.org/33311344026.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/ftjaggv/thin_cardboard_sheets_walmart.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/effective_communication_skills_training_activities.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/hfgeFic/fojulazeb.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/cuisinart_electric_fondue_set_power_cord.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/je1fFif/63734499175.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/JrPaEif/1316454824.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/gfd4jjG/11049314304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468274/normal_602a014f453f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463002/normal_5fedad5b9447b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474727/normal_603b88fb75ec4.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/SBgflhg/zara_usa_sale_dates_2019.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/what_is_the_best_ralph_lauren_label.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/kubota_bx_series_for_sale_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/mokevesin/fjjiaih/fevepupav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fojosotum.myartsonline.com/rixiwusulijajoge.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/white_christmas_tree_dream_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/feng_shui_home_design_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/meditation_nature_music.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/77197993046.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_off000158eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158EB 6084 bytes
SHA-256: e3980dfa2aceb645aae38968c2fa8a0aeb9045c16694d40c4c921f4d7b410947
font_01_sfnt_off00016d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D96 11356 bytes
SHA-256: 8263126dcd3e0797f495d45a0a32341f1242c06c1a47cfe541c44906b9059d15

Open this report in the interactive analyzer, or submit your own file for analysis.