Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd282fe77db4e9e0…

MALICIOUS

PDF

78.6 KB Created: 2021-03-18 12:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4db5d38878bff866f86964da585087e6 SHA-1: 16bb2a8c36be0bbe649144b94925ba7640833246 SHA-256: bd282fe77db4e9e001190e2e004e2e2bf77bdfb9e731a033df9e2e77890d3f00
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various PDF files hosted on disposable domains, indicating a link farm or SEO manipulation scheme. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a potential for malicious content delivery. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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/award?keyword=1995+isuzu+trooper+repair+manual+pdf In PDF document text
    • https://cdn.sqhk.co/guwuweri/gCEigje/28695072650.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/tXc4jfz/osrs_ironman_slayer_guide.pdfIn PDF document text
    • https://bevotiwi.weebly.com/uploads/1/3/1/4/131437753/demukofiji_zopapuzudajeroj.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/KichjT0/gipajolikekoma.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/jblrjjq/parental_control_app_blocker_review.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/henhgeQ/root_cause_failure_analysis_template.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/Gjhjfje/neha_kakkar_songs_downloadming_2.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/hdgcgz7/jipomefimowifeguv.pdfIn PDF document text
    • https://cdn.sqhk.co/sezelijimofi/mwyiijj/zujanepaxemosinaxonuse.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/ghhHjfv/jilanusuwununekovitunurun.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/critical_race_theory_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/zinazejoras/heygejd/27725743769.pdfIn PDF document text
    • https://woteginawewe.weebly.com/uploads/1/3/1/3/131379999/fiwefew.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/UifPR6W/lopuge.pdfIn PDF document text
    • http://remoliwagofaju.mywebcommunity.org/lomawosutet.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/nH3jjnu/helicopter_for_sale_in_usa.pdfIn PDF document text
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/629535.pdfIn PDF document text
    • https://bijufipenonovo.weebly.com/uploads/1/3/4/5/134529550/lakakutawifibexebefa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sanubexudo.rf.gd/if_i_ran_the_zoo_universal.pdfIn PDF document text
    • http://funizenobuwuka.epizy.com/wedurubazaj.pdfIn PDF document text
    • http://vujipuxi.epizy.com/tata_bluescope_sheet_size.pdfIn PDF document text
    • http://zuluvegutadetu.epizy.com/weather_report_huntsville_texas.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_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 5472 bytes
SHA-256: 2a3fe75c9d405e374d15d277f71a8e3c65a519de0217da958a377c247c96396b
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 11192 bytes
SHA-256: fabc803ddea42dbe031ba6a2a88b8ec7273565fa8f860b775392e4cce1dbbf44