Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed28fb87923fc5e…

MALICIOUS

PDF

72.6 KB Created: 2021-02-19 09:26:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 06be37310cedcbeadfbf18eb977ce566 SHA-1: a99e1d65f8f34a09101b0304f409afd246216b24 SHA-256: eed28fb87923fc5e40933d9a3ff4b3e281423e221eae0ff622f75e1f37c7166b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One of the primary URLs extracted is 'https://maypoin.ru/strik?utm_term=what+is+the+air+fuel+ratio+in+diesel+engine', which is likely part of a phishing or malware distribution campaign.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://maypoin.ru/strik?utm_term=what+is+the+air+fuel+ratio+in+diesel+engine PDF link annotation
    • http://dusixose.22web.org/12829306850.pdfIn PDF document text
    • https://bufitalusiwe.weebly.com/uploads/1/3/2/6/132682607/vafonip_wikaworasageze_daroxowok.pdfIn PDF document text
    • http://sotosovidigowi.22web.org/supotixiw.pdfIn PDF document text
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/7906ba71.pdfIn PDF document text
    • https://leditolovon.weebly.com/uploads/1/3/2/6/132682688/kinisipexiropal-kexifido-wuzezubufoludak.pdfIn PDF document text
    • http://delifeschool.com/l_ironie_dans_candidegcnke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387825/normal_602b09178df33.pdfIn PDF document text
    • https://vixagukire.weebly.com/uploads/1/3/4/3/134364056/ridutav.pdfIn PDF document text
    • http://adyga.site/school_report_card_making_software_freeevzco.pdfIn PDF document text
    • https://faberumul.weebly.com/uploads/1/3/0/7/130739640/penila.pdfIn PDF document text
    • http://hotita.space/disgaea_4_promise_revisited_trophy_guidej6tss.pdfIn PDF document text
    • http://widevuvi.22web.org/peak_performance_vinterjacka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojefej.epizy.com/19298324705.pdfIn PDF document text
    • http://lejonawazemu.rf.gd/arkham_city_riddler_trophies_guide.pdfIn PDF document text
    • http://sasavinoseg.epizy.com/what_are_the_ethical_issues_involved_in_this_situation.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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 5184 bytes
SHA-256: 64b57eba58992b19b48c26ee42e05adcf59d518ba218e5a2bdc926c57b53c293
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 10788 bytes
SHA-256: 70d8151517d21e70e6dda331564fd37f94a186f7629b4d01de12dc102d742d75

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