Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b07239145fb944…

MALICIOUS

PDF

90.8 KB Created: 2021-03-09 01:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 98fe0df4d163ff7ec86e485409698d6a SHA-1: 535737d54f42c81a1083c6f599321aea47cec293 SHA-256: d1b07239145fb944877a8aaa24581cae0e365b4adfd30ecfbb8b35f9e4260fb0
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 pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure.

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://kuzutuzo.ru/123?utm_term=angielski+zadania+b1+pdf PDF link annotation
    • http://tufodudem.mypressonline.com/18942180600.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/ethical_issues_in_psychological_assessment_ppt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_60303d579bfca.pdfIn PDF document text
    • http://dvestideyli.xyz/7491268192xha78.pdfIn PDF document text
    • http://byt-upak.ru/srimad_bhagavad_gita_chapter_15_englishcbl4h.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/food_safety_modernization_act_training.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/BjedgeX/72362300064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501965/normal_600190d25b82a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_603b43fa7d281.pdfIn PDF document text
    • http://detonic-romania.website/24549162393m0vi1.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/the_half_has_never_been_told.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/fuN7hp8/42715843839.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/heCihhe/word_search_puzzles_for_adults_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_5fd9904112e1c.pdfIn PDF document text
    • https://sepiboberad.weebly.com/uploads/1/3/1/1/131164555/tunelamusi.pdfIn PDF document text
    • http://eeuuurrrrr.space/how_to_sync_cateye_strada_double_wirelessqoydy.pdfIn PDF document text
    • https://wetebaxa.weebly.com/uploads/1/3/4/3/134343617/bejagezumake-xubeku.pdfIn PDF document text
    • https://tegupovo.weebly.com/uploads/1/3/0/7/130775278/gupofoxukawoguzejajo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416664/normal_5feff2bcb489b.pdfIn PDF document text
    • https://libonatelizipo.weebly.com/uploads/1/3/5/3/135326144/tugeb.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011bdb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11BDB 9800 bytes
SHA-256: 732731a83b74f49f0b8b814d325062dd290b2138ec3cbfd48dcfb0cdbf1def30
font_00_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 5408 bytes
SHA-256: bd26768a89c082842e1ae1ae0b2984cdfb753b5987ead65c50be0f318d5cc91d
font_02_sfnt_off000137bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BC 11412 bytes
SHA-256: 57edeaf722bf4aa6d314290ab1d7dca26b805a343156b85f7eb6d2bf948fa5a2

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