Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b5e694c85e17d8…

MALICIOUS

PDF

66.0 KB Created: 2021-03-17 04:33:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2379997080c9084619e2470e64f153f6 SHA-1: ecaaca047c54780e15ee4e3b3f8945b891317df6 SHA-256: 60b5e694c85e17d88b4073830efca6c9df507a97d0f05173e8e526b69b0fa9d1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attempt to redirect users to malicious or spam content.

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
  • 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://zajinet.ru/123?utm_term=building+skills+for+the+toefl+ibt PDF link annotation
    • https://cdn.sqhk.co/tiwumixe/a8Hhhhi/46150112904.pdfIn PDF document text
    • https://cdn.sqhk.co/dodufiruw/sieHhcd/little_alchemy_2_guide_human.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/dvAgdhi/jopopafatolitunajibadizo.pdfIn PDF document text
    • http://desokore.medianewsonline.com/gumagimuloxulimiluser.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/wowimeluzelinoderifelede.pdfIn PDF document text
    • http://sibogufurab.medianewsonline.com/ansel_adams_books.pdfIn PDF document text
    • https://cdn.sqhk.co/lebinezekoma/cjigIhd/zugivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujafinu.epizy.com/how_to_get_haad_dataflow_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/english_test_level_2_with_answers.pdfIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_540adc38d5304b9ca76768a243bcada6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/printable_weekly_weight_loss_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/14478630800.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/bts_answer_billboard_200.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/reliance_infrastructure_annual_report_2014-_15.pdfIn PDF document text
    • http://lugirike.epizy.com/battery_booster_full.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/endorsement_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/jobule.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/bercow_order_ringtone.pdfIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_22626d5f6f8b4477ae57760868f0d785.pdf?index=trueIn 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_off0000c67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67E 5212 bytes
SHA-256: 2c3de82c4d5ab3ea40c388cb03156fea7e28ca0aed55e08d3f70490793af2618
font_01_sfnt_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 10100 bytes
SHA-256: 41be7f9b601bc67b18ad401b05abc95d46c9c1d821dc489e8dadfb95a8c75d04

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