Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc84b4b90ddd9c68…

MALICIOUS

PDF

74.3 KB Created: 2021-03-14 00:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c98f0fe458a2832058f3c737d75097cc SHA-1: 2260bea40a9b9defd7c62611ab9ebc84db1bcc8a SHA-256: dc84b4b90ddd9c6894380b9de01c7753fdab1b0171e00dec7b381120833009eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a large number of external links, with a critical heuristic firing for a PDF link farm pointing to http://axecheat8.xyz/colliding_continents_answer_keykgori.pdf. This suggests the primary purpose is to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://bologen.ru/123?utm_term=barker+college+junior+school+uniform PDF link annotation
    • http://axecheat8.xyz/colliding_continents_answer_keykgori.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/viiJ7zw/crazy_ol_bird_sunrise_fabric.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/yOjgDnn/kogirawudemaz.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/if3hghj/realpolitik_examples_in_history.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/gcziagj/14614958633.pdfIn PDF document text
    • http://hurleyshamburgers.com/what_does_mean_on_ig1vdt7.pdfIn PDF document text
    • http://myfavoritesun.xyz/2012_dodge_durango_for_saleafqjn.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/AiidVHj/58138111080.pdfIn PDF document text
    • http://losqutoq.online/52451535772x2xtl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_d7dfff8a70aa415e9d30d51c4fcb9524.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tumuzu/voluntary_acknowledgement_of_paternity_form_south_carolina.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/screencast_apk_for_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/sosakulegowok.pdfIn PDF document text
    • https://3633ae4e-9acc-45df-885e-1bfa1481cb44.filesusr.com/ugd/e73054_17bc3e6cfa2f4a3fa3aae13f3f2a3b0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/labour_force_survey_user_guide_volume_3.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/what_is_meaning_of_conflict_resolution_in_marathi.pdfIn PDF document text
    • https://68fdcf0a-b1f0-4758-9edf-48d2be6d990b.filesusr.com/ugd/ac51ce_60397f5fa1ce48d9a64a9a3132f302d6.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_42dbebe5215e48b48b6c9512009fc3a8.pdf?index=trueIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_0b0e1fe8c32a49f699397c226be73b99.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisoxow/45554378365.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_4866918e65634c659220bfb3bb56ab3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/tejudipolamalupomelopovut.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_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 5484 bytes
SHA-256: d7e8bcd34d346cf1b1f99db0e1b4576e19077d0889d14a36cc882ecc009208ab
font_01_sfnt_off0000f66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66B 10928 bytes
SHA-256: 25a56a8fe516e059fb78384884cef1ef41afd73ac2c07357e44830f709144d36

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