Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f75dd4eb706149…

MALICIOUS

PDF

91.4 KB Created: 2021-02-11 18:20:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ac43b2fdd3c5b2a0cc1553c0547494ff SHA-1: d87282c99528aa02a6c848d0380406ca5554f5de SHA-256: 31f75dd4eb7061492311347585215465bf193d21f3e90393a98c6bb97720aaa6
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. Many of these links point to disposable domains or subdomains, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/123?utm_term=final+fantasy+3+sprites PDF link annotation
    • http://zavarivaemvmeste.ru/who_dies_in_endgame_black_widow137yx.pdfIn PDF document text
    • https://cdn.sqhk.co/xezafube/uSgeDib/dream_decor_outlet_west_springfield_ma.pdfIn PDF document text
    • https://vusokozederik.weebly.com/uploads/1/3/4/9/134901716/cc9ea45006e.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/wakatoratir_wopegadomi_paribofulabadu.pdfIn PDF document text
    • http://naturebiolog.space/xuwanodekz5o1p.pdfIn PDF document text
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/viluzonunigedetowu.pdfIn PDF document text
    • http://polnews.xyz/94130431909bytud.pdfIn PDF document text
    • https://xanavixigusom.weebly.com/uploads/1/3/1/4/131453194/a8052a525d.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/wavewuwagupitasav.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/gewesudiriwomofuvaj.pdfIn PDF document text
    • https://cdn.sqhk.co/posaleren/j8Ojhja/h_and_r_block.pdfIn PDF document text
    • http://instahelpforbusiness.com/baby_lullaby_songs_go_to_sleepw2g2u.pdfIn PDF document text
    • http://twitter-center.com/383075441566mmdf.pdfIn PDF document text
    • http://mazafaka69pussy.online/purble_place_for_windows_10_freegotco.pdfIn PDF document text
    • http://itdomen.fun/jurnal_pph_pasal_21f9tbr.pdfIn PDF document text
    • http://dvigatel.guru/machine_learning_books_freejqfsv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ravuxudibure/stadtplan_basel-_stadt.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001129a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 4792 bytes
SHA-256: 7f823835e8cb02432a9b4dac314de103c9aa490b112eb3c07836f8ef9aba7149
font_02_sfnt_off00012d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 10712 bytes
SHA-256: 6de5de937ece523df1798713d77a4383d66dd46cdb54e762ee0937ad7802951f
font_03_sfnt_off000151bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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