Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8b6a605dea5518…

MALICIOUS

PDF

87.1 KB Created: 2021-02-28 17:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e29f9f5ef2ca8b5972e1d352135b14f5 SHA-1: b5ea44b585e93f745da8fc87eba49a6f76bb5183 SHA-256: ef8b6a605dea55186badaf409997ce692dc02c6a63e32ee7cf64ea7177062ac3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with many pointing to disposable hosting. This strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the structure indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/123?utm_term=the+long+winters+putting+the+days+to+bed PDF link annotation
    • http://libralab.digital/free_charity_event_program_templatefsqfm.pdfIn PDF document text
    • https://kevanosum.weebly.com/uploads/1/3/0/9/130968994/3933883.pdfIn PDF document text
    • https://pusiruse.weebly.com/uploads/1/3/4/7/134717846/doxov-takumesusu-sovepevigu-gidep.pdfIn PDF document text
    • http://wonozudobitisog.scienceontheweb.net/when_is_the_new_twilight_book_midnight_sun_coming_out.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/zajowumozed_badowubipa_pakema_bedufuturoxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413867/normal_5fef0ac577868.pdfIn PDF document text
    • https://seporarutigofu.weebly.com/uploads/1/3/2/7/132741198/famobovero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6039d6b8605d6.pdfIn PDF document text
    • https://sadupomojafex.weebly.com/uploads/1/3/0/7/130776775/f2d197.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/varoxijewegot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/64249401392.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/iti_online_admission_form_2019_gujarat.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_off00011447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11447 5504 bytes
SHA-256: bee9fcd23cbffef9f7ad65cd772c76bc42ad5d5044d3d8b27ac895891aa2991b
font_01_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 12000 bytes
SHA-256: f0e88ccd43663bfb37c0495ca93aefe46492dd8d425de5be3f4681f6ff7c5e90

Open this report in the interactive analyzer, or submit your own file for analysis.