Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a700353f89ecf8…

MALICIOUS

PDF

65.0 KB Created: 2021-01-25 10:20:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4c25adb75756b94c60e499cbb3d7ec21 SHA-1: ea74f864c008a08e7e4acc449df07e6cd8a36002 SHA-256: 73a700353f89ecf880ffcb90608722c96ff50faed4ee0608e5a432a36ddf14f9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though malformed, contains text related to a 'physicians cancer chemotherapy drug manual', likely a lure to encourage clicks on the embedded URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=physicians+cancer+chemotherapy+drug+manual+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/goworonol/tugcqaQ/nusifudu.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/cFhcja4/hd_spy_camera_online_shopping.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/fjdkTia/nasofizorenitigidi.pdfIn PDF document text
    • https://xifemobagot.weebly.com/uploads/1/3/4/0/134000541/reboge.pdfIn PDF document text
    • https://gofutetawavoror.weebly.com/uploads/1/3/0/8/130874623/rakorufinadokuduw.pdfIn PDF document text
    • https://cdn.sqhk.co/bunewonu/PtsgdfH/padorupuzujepa.pdfIn PDF document text
    • https://sazejibapox.weebly.com/uploads/1/3/4/8/134863873/a0876f3b9072e.pdfIn PDF document text
    • https://cdn.sqhk.co/vigamodijek/djihihc/usa_today_discount_subscription_offers.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/gjhhctr/rofilexizo.pdfIn PDF document text
    • https://mulodetudujidof.weebly.com/uploads/1/3/5/3/135325190/45bb99cd2a0.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/tcgg4ij/47861131276.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/xViciey/vakunobedavunivivunaseru.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/jgqjMja/transparent_glass_screen_protector_note_10_plus.pdfIn PDF document text
    • https://xefagopabori.weebly.com/uploads/1/3/1/3/131379938/kigofu_bunajera.pdfIn PDF document text
    • https://kokujilu.weebly.com/uploads/1/3/1/4/131453241/rofazisuk_zuruto_gewif_nagujasuzu.pdfIn PDF document text
    • https://kexexetipo.weebly.com/uploads/1/3/4/8/134897314/4b91b087dfe444f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/excel_spreadsheet_character_limit.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_off0000bef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF4 5948 bytes
SHA-256: d7d779dac7636198c3c0c009e0929842959c514c984a55b00a8e25b4b7b5f3c7
font_01_sfnt_off0000d31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 10372 bytes
SHA-256: f443ac197d800c272d414c5f4a1c0e1376881db8156a76b30f9d2a02ea2b66a3

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