Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcea828745bfa252…

MALICIOUS

PDF

75.8 KB Created: 2021-03-31 10:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2b7bb19844a87ef1a63fc9b94cf01ba5 SHA-1: 49d17da1f34598b2f21f4cf56e28cc1c5d99e007 SHA-256: fcea828745bfa25222a46416b5a337431aed7cc16b4d7cc557c9f47e90106cab
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://crophysi.ru/123?utm_term=urine+culture+test+report+sensitive+means'. This indicates the document's primary purpose is to trick users into visiting a malicious site, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the embedded URLs and link farm heuristics strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=urine+culture+test+report+sensitive+means In PDF document text
    • https://cdn.sqhk.co/joxopejufito/K6hemjg/express_color_block_dress_shirt.pdfIn PDF document text
    • http://pewujok.mypressonline.com/73988400973.pdfIn PDF document text
    • http://mevakimuvu.mypressonline.com/vefutixor.pdfIn PDF document text
    • https://cdn.sqhk.co/boduzapun/LjcShcE/cl_blends_worksheets_free.pdfIn PDF document text
    • https://cdn.sqhk.co/davusegeb/iWnjgge/crypto_wallet_fees.pdfIn PDF document text
    • http://alisaborodaenko.design/lotoze6x6ag.pdfIn PDF document text
    • http://makeyourself.xyz/nokajowi622cp.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/hhgh6hb/cholesteryl_ester_formation.pdfIn PDF document text
    • http://front-glass.website/is_iodine_aqueous6y1dn.pdfIn PDF document text
    • http://reduslim-official.website/digimon_lost_evolution_translationhugpl.pdfIn PDF document text
    • http://vubunojetufofi.iblogger.org/69028372394.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zimemotom.rf.gd/pidagazajoxabejunotipusus.pdfIn PDF document text
    • http://zorufuzelal.rf.gd/wurusidugozojo.pdfIn PDF document text
    • http://rukapaloxekini.rf.gd/chupke_chupke_full_movie_720p.pdfIn PDF document text
    • http://posowisame.epizy.com/67672449526.pdfIn PDF document text
    • http://zebepireliwidoz.epizy.com/processual_archaeology.pdfIn PDF document text
    • http://xekujigifur.epizy.com/psychology_books_marathi_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/16785833566.pdfIn PDF document text
    • http://fifetovijoweka.rf.gd/what_is_discipline_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/how_to_get_your_permit_in_south_carolina.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_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 5132 bytes
SHA-256: d21b4c875156292a98a190162f3e35c380f8c9a592f6490fe230f4cc010488ad
font_01_sfnt_off0000fdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBD 10572 bytes
SHA-256: 94255dc215cd144554909f2fe234fb6a70e532500a7456446e88988d13294b43

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