Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed47b96b5c44f4c…

MALICIOUS

PDF

76.9 KB Created: 2021-04-06 00:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 47eabc66caf63b7de7fcbb9cb3555640 SHA-1: c1b4c19d2e32643edc89e888f640b7e46d7f22e6 SHA-256: 8ed47b96b5c44f4c78223b5e1feb34fa0cc2d481a9baae44ece08dd5f951898f
252 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=lawn+boy+service+manual+pdf In PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/7384474.pdfIn PDF document text
    • https://wegujelad.weebly.com/uploads/1/3/0/8/130813898/9650866.pdfIn PDF document text
    • http://tolujupa.22web.org/metformin_tablets_ip_500mg_uses.pdfIn PDF document text
    • https://satewode.weebly.com/uploads/1/3/1/4/131407014/5cfee2cb90e5.pdfIn PDF document text
    • https://jijixedo.weebly.com/uploads/1/3/1/3/131398351/zimorabuj.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/keragapuf_devunubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukasorepej.rf.gd/fuxemurexopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9465619d-ab21-4e49-9da7-f16bc18d5379/dragon_age_origins_class_tier_list.pdfIn PDF document text
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_78c06f1f68584f8d8d6dfd9622b3d3a1.pdf?index=trueIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_e32a2a0184f04c30a70f2a879ff9d8bf.pdf?index=trueIn PDF document text
    • http://xujalev.rf.gd/rubisazixolubapowiser.pdfIn PDF document text
    • http://gadivedu.rf.gd/pakijuraguturat.pdfIn PDF document text
    • http://jizanisan.epizy.com/fuwodemijipi.pdfIn PDF document text
    • http://zituramipexi.epizy.com/worthy_of_it_all_chords_c.pdfIn PDF document text
    • http://kesekerezox.epizy.com/xazuxulosirojogowuditob.pdfIn PDF document text
    • http://boligasenupe.rf.gd/vadidipege.pdfIn PDF document text
    • http://bofawujataja.epizy.com/what_is_the_job_description_of_assistant_sales_manager.pdfIn PDF document text
    • http://tipikirobis.rf.gd/mekolunizabiwakivere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8501ce4-168f-407c-bf57-26817889817c/xutovazebaviwalusoro.pdfIn PDF document text
    • http://mukadepokexow.epizy.com/resistance_band_workout_routine.pdfIn PDF document text
    • http://janalusexisowa.epizy.com/kikajigesuwoxidozepo.pdfIn PDF document text
    • http://zosenesewil.rf.gd/australian_map_outline.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_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 5636 bytes
SHA-256: 664540ab8edc5470c75ed3132cc979921fa88f3a4676c62f2c65f27fb57234c6
font_01_sfnt_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 10532 bytes
SHA-256: a1b8b7876e7eb5f426ba86d2e09b748bcea2fbd048809c49cc9628b5134855b8