Malicious PDF — malware analysis report

Static analysis result for SHA-256 c499e7b52da22dfe…

MALICIOUS

PDF

76.8 KB Created: 2021-02-14 12:54:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eecb0f43cfe956211cfda8dd3bcc68e SHA-1: a2de9152ee427b6b506fdea34dcedc4a0f1b2f1d SHA-256: c499e7b52da22dfef91fa89bb152faba761778c925503786b2a7735ea1f99756
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are generated for SEO purposes, indicating a link farm or spam operation. The primary URL, 'https://seumenha.ru/wix?keyword=toys+that+start+with+pl', suggests a lure to a website disguised as a search result. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded content designed to redirect users. No scripts were extracted, but the PDF's nature points towards a phishing or SEO spam attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=toys+that+start+with+pl
    • https://zegabanibo.weebly.com/uploads/1/3/5/3/135339571/sofekonezufejo.pdf
    • https://bakadowo.weebly.com/uploads/1/3/1/3/131380427/kikex.pdf
    • http://onenature.space/diffusion_and_osmosis_problems_worksheet_answer_keyh9eon.pdf
    • http://steelsho3.club/embroidery_designs_free_for_suitsezd5v.pdf
    • https://cdn-cms.f-static.net/uploads/4485446/normal_6024733ed3c2c.pdf
    • http://vezdesami.ru/bhai_the_gangster_game_apkpure2iezf.pdf
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/9c16692.pdf
    • https://cdn-cms.f-static.net/uploads/4451929/normal_60113a0a51b87.pdf
    • https://cdn.sqhk.co/pikevasoze/DKjhlij/online_racing_games_for_pc_without_download.pdf
    • http://vorugakolijek.22web.org/severopizegunuvamopevam.pdf
    • https://samaruwopag.weebly.com/uploads/1/3/0/7/130738554/lukifoxoresoraw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dejolavubukugeb/janesville_car_accident_reports.pdf
    • https://s3.amazonaws.com/gidibesuxi/you_too_brutus_malayalam_movie_link.pdf
    • http://bokatamekal.rf.gd/63724209368.pdf
    • http://zotawof.rf.gd/cork_research_ethics_committee_application_form.pdf
    • https://s3.amazonaws.com/jaloto/update_android_9_lg_g7.pdf
    • https://s3.amazonaws.com/sowirutelevolur/salaberudirorebu.pdf
    • http://dimegebewode.epizy.com/govurex.pdf
    • http://moliposapivar.epizy.com/cardiac_arrest.pdf
    • https://s3.amazonaws.com/rumezo/reporting_vaccine_side_effects_australia.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e240.bin
d61054221e54de82acb010d98f6975ec4d8ea718e7170711bfc27b779358a394		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 4616 bytes
font_01_sfnt_off0000f20c.bin
899c53baf27a6e576dbc970350c0519754f86267c618834a6866779aebb92c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20C 11004 bytes
font_02_sfnt_off0001177c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 4324 bytes

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