Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d85a8330f87492…

MALICIOUS

PDF

66.7 KB Created: 2021-02-19 11:03:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a9ee1ac6d3dd529a27f66779485006f7 SHA-1: 8faa0cc13daf54dc390484cc83fbf05c1c6b617d SHA-256: 19d85a8330f87492470b3f33f7bb06ef7ebec534b40c0def3c620ea8d92f5af2
304 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by multiple heuristics, including brand-impersonation credential phishing (Netflix) and redirection to known malicious infrastructure. The file contains a large number of embedded URLs, many pointing to disposable domains and link farms, suggesting an attempt to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing attack vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/7547986.pdf.
  • 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=domain+and+range+worksheet In PDF document text
    • https://cdn.sqhk.co/nijusukelok/gfiibtr/sniper_elite_zombie_army_4_steam.pdfIn PDF document text
    • https://cdn.sqhk.co/ritafase/geghggr/18554647371.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/5uO0tqA/hungry_shark_heroes_hack_download.pdfIn PDF document text
    • http://meetchat.space/city_ward_mapbc398.pdfIn PDF document text
    • http://startask.ru/mokulibazuvenodekapakanepvxca.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/jbM7qjd/fashion_story_hack_android_apk.pdfIn PDF document text
    • http://formblckr1.xyz/the_hitmans_bodyguard_online_free1bihl.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/ggiejfh/56680359577.pdfIn PDF document text
    • http://55571.ru/the_sacrificial_egg_summaryy3pjx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415534/normal_5fd77b8841a16.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/7547986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475219/normal_6018326da1f93.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/bbZskgf/79144898612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_6022bca8b1d21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425487/normal_5ff5b5e8c6b57.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/xeruxaxer/colours_tv_show_website.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/godless_netflix_episode_guide.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_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 5360 bytes
SHA-256: ec6ef47e810fb5a2fee96f693b9cc744e4161b7f151d0da8cad53736d08928e5
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 10800 bytes
SHA-256: 06680ea2b422dda09991a03250fd7bc3d4bf4ce035c6a76be8db305966325f0f

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