Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81f733481ca3747…

MALICIOUS

PDF

87.6 KB Created: 2021-04-05 19:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c802d6c48f4965b190cb676c32681ff2 SHA-1: 8d0fdc14425b5e59df70a7ec1e3f6ef7c46e760c SHA-256: f81f733481ca37471d3b3d82da2565f5a2fa9e63c51fd843d516784ae1df5776
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' and a 'PDF_SEO_UTM_REDIRECTOR_LINK'. The primary malicious URL identified is https://pelibifir.ru/strik, which is likely used for phishing or to redirect to further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/strik?utm_term=what+order+is+50+shades+of+grey+movies PDF link annotation
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/e25a753.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/rusaw.pdfIn PDF document text
    • https://nobiramiw.weebly.com/uploads/1/3/4/4/134403563/kovaxadabeluw_zamorol_janutaluneserib_duzatajeg.pdfIn PDF document text
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/20bd76d4f2.pdfIn PDF document text
    • https://pekeweluxema.weebly.com/uploads/1/3/5/3/135304067/def178fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b8673f-bdd1-4b71-963a-adef9d315a4e/jump_rope_workout_benefits_cardio.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/bitdefender_box_2_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d81f7fa-b0e4-4617-b561-3d45e237c180/graco_duoglider_stroller_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/interview_questions_on_communication_skills_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/cateye_velo_7_bike_computer_review.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/daselebozefuronimevutanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3963871-8fd4-4f24-b1ea-73a215438cb9/kaplan_mcat_prep_books_second_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/82251968377.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/21491353991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f95808-0a60-46c2-bfe7-749b7b8efcf7/what_is_the_power_of_prayer_according_to_kalam.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/60571330773.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/walmart_corporate_sustainability_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a6f8cc-acd0-4c4a-a4e0-3b08ce66a6eb/bible_study_and_home_cell_guide_2020_twi.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_off000113c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C7 5732 bytes
SHA-256: c84f75915ed6ab96d987fac5297ab82c943a4020422df307c28735623a7ac9a0
font_01_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 12752 bytes
SHA-256: 6934cd0d8afd89295f070b03e0955b3e5056afab84bc8c3a1fcb3cc2469086ad

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