Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95a6380cd695e61…

MALICIOUS

PDF

81.7 KB Created: 2021-03-21 02:59:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 710cbbf92b9fdd40b086f0ca0fd4463c SHA-1: d90aef151fe6b95b1883ce4ff316d9bc0340c5e0 SHA-256: b95a6380cd695e6187c4e6c1dfe1c5be0f868f49f7e1f8bd33039e135f46cecc
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/aws?utm_term=transformer+design+formula+pdf In PDF document text
    • https://cdn.sqhk.co/sevigexew/xnijVcQ/super_helix_ghost_jump_mod.pdfIn PDF document text
    • http://domsale.xyz/salopakifosokexozenirqwtg9.pdfIn PDF document text
    • http://rukozhop-guide.com/xijalubesoxu7u8wd.pdfIn PDF document text
    • http://smartcreditcheck.info/80142152298qcod0.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/ieVihto/vipixub.pdfIn PDF document text
    • http://pubgucbayim.com/welcome_page_template_html_css8fy8o.pdfIn PDF document text
    • http://nesobaka3.xyz/what_is_the_definition_of_curriculum_evaluation7i3on.pdfIn PDF document text
    • http://busivel.xyz/73996001412mmb4j.pdfIn PDF document text
    • http://frasqen.online/5306628499pe6hj.pdfIn PDF document text
    • http://xatovapotogu.mywebcommunity.org/myasthenia_gravis_in_dogs.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/fjfFhh9/duvuxanunixavorupak.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/4gcibhg/remusitegekarurobube.pdfIn PDF document text
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/xazeruripovem-nenejubowul.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/sazujenu.pdfIn PDF document text
    • https://cdn.sqhk.co/minofavazu/Wgdieic/time_spread_timetable.pdfIn PDF document text
    • https://cdn.sqhk.co/fagisuxupinu/nNhe30I/oddmar_android_review.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/bidiejf/57406796148.pdfIn PDF document text
    • http://vevaroda.scienceontheweb.net/2008_jeep_grand_cherokee_diesel_fuel_consumption.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/cCigV3L/games_like_pet_shop_story.pdfIn PDF document text
    • http://xifutipixa.mywebcommunity.org/zejazasaf.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
    • 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_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 5112 bytes
SHA-256: 0e5410c716a9717b3f27c05eaae8aa5d6d24084a1b4fd6dd7a946dbf6263c433
font_01_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 11272 bytes
SHA-256: 293b988041fabe5fbfd284206ff8ea57358f680616db0a5295462d0b5102f027
font_02_sfnt_off00012b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B60 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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