Malicious PDF — malware analysis report

Static analysis result for SHA-256 45464607e404c36e…

MALICIOUS

PDF

78.3 KB Created: 2021-05-11 20:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c46428d7988df9e75ca8d09c082e3f11 SHA-1: eee831f1f87ad27bbc97eeb5b6af627ac07024a0 SHA-256: 45464607e404c36ecb0411f7267cfa9640bde62a9094af20ca522f8e3d539d37
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to exploit users by directing them to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://gimoguvi.ru/strik?utm_term=how+do+you+turn+off+a+doro+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446280/normal_600b1afa4d79a.pdfIn PDF document text
    • https://jutegonepot.weebly.com/uploads/1/3/4/0/134016653/6532442.pdfIn PDF document text
    • http://vijofudevadotar.mywebcommunity.org/62807482032.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/lugar_pafasesemupomap_tugonoxogef_zuwokozinowepo.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/ejfhbc0/brand_management_certificate_programs.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/gfwXhbQ/rezaponedi.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/Bieiihh/gmail_calendar_in_outlook_not_syncing.pdfIn PDF document text
    • https://suzonozumevudem.weebly.com/uploads/1/3/1/3/131379217/pidudukap.pdfIn PDF document text
    • https://cdn.sqhk.co/zaweniwefi/6haHpha/25990466578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_5fd9f8f955694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_602051046c50d.pdfIn PDF document text
    • https://kotirilu.weebly.com/uploads/1/3/4/3/134332744/6830dcfb30c7e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_60304d98b33a5.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/jawifazegesenol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_6045f7dd44d11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454808/normal_6010cb1cc5a48.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/80674432350.pdfIn PDF document text
    • https://cdn.sqhk.co/wavoperusina/LRP7Dgh/madikoporisus.pdfIn PDF document text
    • https://dipediras.weebly.com/uploads/1/3/0/7/130739778/limenezedeni-xujexi.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/lovomijelun/bigilituxaderis.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/graco_myride_65_height_limit.pdfIn PDF document text
    • http://rugoxesoteko.myartsonline.com/caida_de_tension_centelsa.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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 4908 bytes
SHA-256: e1f8d697a64b97bd5489eda543825c4e57ef808d60e24e87cde9ebd542d23112
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 11592 bytes
SHA-256: b0c1d478afe3cccfe03d3f88e72c604a874eac1013f7ab246c5eb68e815f8946
font_02_sfnt_off00011dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e