Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2d81e3e4e32b6e…

MALICIOUS

PDF

88.4 KB Created: 2021-03-21 10:32:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9820e25274f6d9615550d17a223f23de SHA-1: 71b7aa4104f2e801c6209b640b5858c11850eade SHA-256: bd2d81e3e4e32b6ecb7418da2633bd12a63418836c8cbea96b3029a2013bebda
244 Risk Score

Malware Insights

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

This PDF contains a large number of embedded links, many pointing to disposable hosting services, suggesting a link farm or SEO spam campaign. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=how+to+be+a+proverbs+31+woman+pdf In PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/ZHcDjg0/mountain_climbers_axe.pdfIn PDF document text
    • https://duxegebipuvakij.weebly.com/uploads/1/3/4/0/134095857/guxigaj.pdfIn PDF document text
    • https://mevamakokuvafas.weebly.com/uploads/1/3/4/0/134040887/kulalukizurujof-vevutupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382209/normal_60365c2b1d832.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446497/normal_5ffce22bdcebd.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/suvopili.pdfIn PDF document text
    • https://cdn.sqhk.co/peporewav/ipSibhc/love_creek_orchard_apple_picking.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/vpgeHgg/78197853517.pdfIn PDF document text
    • https://cdn.sqhk.co/dijadive/rGgihbf/26188806889.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/UOicjis/ice_cream_truck_for_sale_craigslist_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/ropikenetu/dicgfsO/648490956.pdfIn PDF document text
    • https://morexenuf.weebly.com/uploads/1/3/5/3/135311883/08909.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/gJm8jdO/baking_recipes_without_butter_or_margarine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_604cceca88eb8.pdfIn PDF document text
    • https://cdn.sqhk.co/sulugedako/iegeidG/16760807504.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/jfojbjf/samsung_galaxy_star_wars_wallpapers.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://uploads.strikinglycdn.com/files/928b2e35-2932-4528-90af-c271a017cd35/what_happens_if_i_burn_gold.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8909e1f-9eab-452b-a793-34a42bb3a1ff/97745244379.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6da61f6-1c7e-4158-b0dc-97bb8328d92f/nokefuboboz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd1700d3-38cc-43f5-9ebb-1cb4f5933dc1/lizin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C63 5364 bytes
SHA-256: 784ebea5e763d08f702d8002ba9f3695427bc082b16b360ea1c17b8f818e5f2e
font_01_sfnt_off00011e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E91 11344 bytes
SHA-256: b7e9577d2a57e90e1817ea0c3630363d2f6d9def533169928302510f5e31075e
font_02_sfnt_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378