Malicious PDF — malware analysis report

Static analysis result for SHA-256 90728364ae8ec976…

MALICIOUS

PDF

82.2 KB Created: 2021-04-10 06:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6b126c0b63234ad8e8a1f835eacc7361 SHA-1: 2c74f2ab11c3f1999130611f4135ee1ec33ecfa8 SHA-256: 90728364ae8ec976033abdc1dd9185ae1381eccc34e8201a018be5f9f29bdc42
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to a known malicious redirector infrastructure at 'https://yafferge.ru/strik'. The document body, though partially corrupted, suggests a lure related to health exercises, which is a common tactic for phishing or malware distribution. The presence of multiple links on disposable hosting further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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/strik?utm_term=what+exercises+to+avoid+with+diastasis+recti In PDF document text
    • http://pop-marketplace.ru/dutufigodifipobaxufboer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502246/normal_6001ccba2426e.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/cours_sur_les_amplificateurs_de_puissance.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/99124783293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415770/normal_6008b5dc79f50.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/48961170583.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/dimerodamulajaxafi.pdfIn PDF document text
    • http://vetozadep.mywebcommunity.org/42392628729.pdfIn PDF document text
    • http://italylife.pro/help_steps_para_kazanmamdb76.pdfIn PDF document text
    • http://resimpub.com/active_listening_techniques_paraphrasing5jr9j.pdfIn PDF document text
    • http://podarokinsta365.site/99692058454e2roo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445338/normal_606d1f10db2e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fca7b847c97f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lonesopuw.onlinewebshop.net/arcmap_georeferencing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1345dbca-a53c-4e7c-bcc4-5a6d4d5ee8c4/13507798040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779cd312-47c7-45f1-84a5-d52b6b6703e6/sahih_bukhari_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ca85a5-0979-4731-97b4-f84a63bfb214/fivizoxixukopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/706b29f9-1a06-437b-a1b6-1e88189a459d/cub_cadet_ltx_1042_kw_parts_manual.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/blackbird_guitar_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ddd84d8-a05e-4efe-9ee6-6c8b1c4faed2/2008_dodge_grand_caravan_headlights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264eb88d-c6ef-449b-9663-cb4987f9ec87/the_magicians_season_2_episode_6_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603427df-b3f6-4641-bd9b-ff2c4b0ac5eb/is_6_figures_enough.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93df6a74-d3c2-4aef-b24b-b7af11d0dfa1/gawurovara.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_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 5228 bytes
SHA-256: 07cf8286d0d956fa189af0fd2ad7901c7f42baddb02510d7b6e575930ab96dcd
font_01_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 10468 bytes
SHA-256: 71bb0e70a5a70d324a13fd1cb227a2043277998233050985e676553e5dbd4aec