Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e533b4d1dbc721d…

MALICIOUS

PDF

135.4 KB Created: 2021-03-09 01:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 487964c7fc419bb627a0710abdbe7258 SHA-1: bc6498e18c6ce56c90e2d9cb47d9b0155f83d18b SHA-256: 7e533b4d1dbc721d47eeabb482c6b3ea13dda5c2185a35531f3855b74883aaac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://zajinet.ru/award?keyword=callan+method+book+2+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390383/normal_603ae9aa97cde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_5feaf5a118862.pdfIn PDF document text
    • https://jikegasabum.weebly.com/uploads/1/3/1/8/131856907/4661401.pdfIn PDF document text
    • http://wirelessinfo.ru/buvor1mvrv.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/rajerozunovulab.pdfIn PDF document text
    • https://pomaxobizo.weebly.com/uploads/1/3/1/1/131163853/fa2a14322.pdfIn PDF document text
    • http://sokuzise.iblogger.org/wirevogujapuvaroriragif.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/how_to_self_clean_bissell_crosswave_cordless_max.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410000/normal_5ff16bc09dc5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459787/normal_5ff08ecbb3c6c.pdfIn PDF document text
    • https://nivolepefusux.weebly.com/uploads/1/3/4/8/134886615/5f7c1b89.pdfIn PDF document text
    • http://waferaboteb.mypressonline.com/53979003570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489983/normal_603e5a827a90a.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/89af42d2b8c.pdfIn PDF document text
    • http://jotipire.iblogger.org/86668451693.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fenigubigona.epizy.com/the_way_home_movie_in_tamil.pdfIn PDF document text
    • http://tuxigufujera.rf.gd/51260390518.pdfIn PDF document text
    • http://suzimisefodude.epizy.com/bili_bili_akh_guri_song.pdfIn PDF document text
    • http://xaxidos.epizy.com/espace_virtuel_answers.pdfIn PDF document text
    • http://vanakodezifezuv.epizy.com/icai_exam_date_sheet_may_19.pdfIn PDF document text
    • http://xizujibonow.epizy.com/what_places_have_gluten_free_food.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/47223808442.pdfIn PDF document text
    • http://nidemavaguwagev.rf.gd/free_award_presentation_powerpoint_template.pdfIn PDF document text
    • http://kopolug.myartsonline.com/fikutopelowujiv.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_off0001d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6FE 5436 bytes
SHA-256: c8c5c98f42038fcecc920ca54fc327b44cd6b373b20b7013c4ab664f8a9051a3
font_01_sfnt_off0001e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E95C 11676 bytes
SHA-256: 2b05c4e5936d8242da36483e88c848a3b07933bb8d690170ddbf5b48ad1d380c

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