Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd9fe5250e4b359…

MALICIOUS

PDF

73.7 KB Created: 2021-02-13 12:15:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: abdad3c657947a65000005b72845e957 SHA-1: 26f4f0bbeb3b8136deafc3bc62ed3dff282606bf SHA-256: 8fd9fe5250e4b3595b32cfd308b8ba44969863d24ca14b6fa5aa9293a9f7f10a
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious or disposable domains, identified by heuristics like PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the document's structure and embedded links suggest it's designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=whiten+teeth+photoshop+express In PDF document text
    • http://biomanua.website/wonder_woman_bloodlines_freeob0oo.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/3rkqiPp/daxubobanizobataruxire.pdfIn PDF document text
    • http://lastasked.com/alfresco_community_5._2._3s0aci.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/efhcxVb/favulebesarerixenazavek.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/FMwKgcb/piano_music_maker_game.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/nutagavafo6igny.pdfIn PDF document text
    • http://raifaisentapp.online/jajelyjun4.pdfIn PDF document text
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/lagusena-gexapozup-wimulero-lujupuzibafiz.pdfIn PDF document text
    • http://thecet.xyz/34049749143b6jwx.pdfIn PDF document text
    • https://buvikibera.weebly.com/uploads/1/3/1/4/131453013/8018963.pdfIn PDF document text
    • https://cdn.sqhk.co/mepowokugo/wiaggih/xilofebenakuguvazo.pdfIn PDF document text
    • http://stalekost.site/jirexuzotuxiret2h69.pdfIn PDF document text
    • http://bevubexawaxuro.22web.org/88474090345.pdfIn PDF document text
    • http://detonic-romania.website/mojovumotumosivinovumav4335.pdfIn PDF document text
    • http://ketotreno.buzz/27315232369apo9s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soxosodazafu.epizy.com/pikev.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/wow_arcane_mage_tower_guide.pdfIn PDF document text
    • http://bubewap.rf.gd/achyutam_keshavam_krishna_damodaram_hd_video.pdfIn PDF document text
    • http://gumelojapa.epizy.com/bahubali_2_sivan_ringtone_tamil.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_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 4744 bytes
SHA-256: d5ee12a3dc18bdff93516734a3b4983a1063778e9694d9bb00dc5dab7adb8816
font_01_sfnt_off0000f535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 10628 bytes
SHA-256: 8a41ef1ae89fcdccd9bb857af4c840b6a917aaa853e84d081bc630fdb39234fa

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