Malicious PDF — malware analysis report

Static analysis result for SHA-256 b673b14f326b24ef…

MALICIOUS

PDF

82.5 KB Created: 2021-03-22 07:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 09b885ed502f0308987dd0b6edef3301 SHA-1: dbb98808741e3499c63cea97b452aedc563a22e3 SHA-256: b673b14f326b24ef6997060c30119a6ba574613efceea3040e81de0837ba606c
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable domains and redirector infrastructure, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or malware distribution. The document body itself is heavily obfuscated and contains metadata that does not align with typical user-facing content.

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
  • 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 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.
  • 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://yafferge.ru/123?utm_term=hegemoni+amerika+serikat+pdf In PDF document text
    • http://vengriya.space/25262282455az82m.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/ritud.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/dKxhgZ1/csds_vinyl_south_mason_road_katy_tx.pdfIn PDF document text
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/venebuxavil_bavaboruka_tokapeji_tarenawok.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/4bCyGhd/uncomplicated_urinary_tract_infection_treatment_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/hcpLqgc/387702478.pdfIn PDF document text
    • https://cdn.sqhk.co/nadipozow/86ggMgj/digital_marketing_coursera_answers.pdfIn PDF document text
    • https://gokebapin.weebly.com/uploads/1/3/5/3/135320588/zizibi.pdfIn PDF document text
    • https://cdn.sqhk.co/jukowejazus/ifVgdhg/22876487590.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/banunugoperuderelat.pdfIn PDF document text
    • http://itdiscount.pro/how_to_record_running_on_iphonejjdkn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489839/normal_603e2a46a158c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_604af1719098a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408719/normal_5fc8b89883e93.pdfIn PDF document text
    • https://rerigexoz.weebly.com/uploads/1/3/4/5/134510817/kizutep.pdfIn PDF document text
    • https://vufegolafo.weebly.com/uploads/1/3/0/9/130969987/tivakafokuvukiji.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/zoroxifu.pdfIn PDF document text
    • https://lomivurusizova.weebly.com/uploads/1/3/4/8/134868764/d72268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379839/normal_6006d2337bef4.pdfIn PDF document text
    • https://bozobazevadetob.weebly.com/uploads/1/3/1/6/131607158/4abce4fa165.pdfIn PDF document text
    • https://vujipobunovopo.weebly.com/uploads/1/3/5/3/135324227/jumesetokiluris.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/89013.pdfIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10453 5352 bytes
SHA-256: abf57defe5f46f2a362a034a690e3b036e88df0529ff32cc249f6d1b747a85dc
font_01_sfnt_off00011670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11670 10796 bytes
SHA-256: 41bd2c5e90701beb4750ffecc57e0c4ca70b7821683d57ba81a8838de1b67891