Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f09a9493c33c842…

MALICIOUS

PDF

69.2 KB Created: 2021-06-14 08:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d53f245d5dc3b265ef695daf354fd8d6 SHA-1: 52c3398606183ed532843f43bad97c4e11a493e3 SHA-256: 6f09a9493c33c842a63c8232d0224ef1b8726d89b93a7370e5c3f7e8916abeaa
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to .pbworks.com, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links are indicative of a malicious document, potentially a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/pbw?utm_term=mahabharat+krishna+tone+download PDF link annotation
    • https://mixabukosi.weebly.com/uploads/1/3/4/4/134479433/07410864.pdfIn PDF document text
    • https://vugigedekamem.weebly.com/uploads/1/3/4/3/134339685/fd87b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144454173/35350952729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03ecf0c-c444-4442-ac08-ba96b3c6219d/why_is_my_dryer_not_drying_my_clothes_completely.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d7b203e-b72c-4f63-8139-b81f0848dc1b/bosch_dishwasher_installation_rebate_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e800689a-c989-4f10-b566-bfbc7611f1f5/road_signs_and_their_meanings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b890abf7-1d74-4c1c-b016-b226820e7f13/what_is_political_satire_in_animal_farm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5542ddea-9905-4529-8c26-d51e314acf4b/48091358651.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/f/80994807237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/158485ae-f624-4af6-bb53-81a3355464f3/how_to_clean_delonghi_portable_air_conditioner_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d44737e-7ab4-40bf-8301-d835473f39c1/61019265228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb2ecbb-e68f-4167-9347-a22b85aba892/harry_potter_castle_universal_christmas.pdfIn PDF document text
    • http://zafasuvolo.pbworks.com/f/petroleum_ether_polar_or_nonpolar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51020e60-f193-42b0-9969-35897c616236/10.4_practice_b_geometry_answers_big_ideas_learning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3af9889d-3e30-4b57-ae8d-d04ce1a35c6e/steal_this_sound_book.pdfIn PDF document text
    • http://vipafuwusawe.pbworks.com/w/file/fetch/145116228/nice_to_meet_you_sub_indo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122940fc-9628-4d66-902a-d1855f4306cd/comcast_xfinity_dvr_cost.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_off0000d0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EB 5212 bytes
SHA-256: 49def5abd82131e4d9fa986409c8e8eee5518dc10d3b63b35adbc459a60d1d84
font_01_sfnt_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 10712 bytes
SHA-256: 39f8650d71a10016ec2e61f16c6b9e702ea9dc15b76a824539c258a9e9f25601

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