Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1341b9e4b2690f7…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 03:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0005572d175252431d1cba730ae70d1 SHA-1: ebdf97b9898745809a54671a9d8f370239396c95 SHA-256: a1341b9e4b2690f75537c98ecddd863dd15d50b72d195525a5dd23c81e2600b3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were extracted, the presence of numerous external URLs, including suspicious ones like 'ponafet.ru', points towards an attempt to redirect users to malicious content or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/strik?utm_term=how+to+connect+a+furby+boom+to+the+app
    • http://gagefiwirimat.medianewsonline.com/best_tablet_for_reading_and_annotatings.pdf
    • https://nasipowo.weebly.com/uploads/1/3/1/3/131383467/fovufewolidej.pdf
    • http://kenugizi.getenjoyment.net/sukogugirobo.pdf
    • http://buwubaled.mywebcommunity.org/26438074399.pdf
    • https://tedumevoseviman.weebly.com/uploads/1/3/5/3/135311532/3817336.pdf
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/lukaxinatanoj.pdf
    • https://kulipimeg.weebly.com/uploads/1/3/2/6/132695915/f56a0e74c9713.pdf
    • http://sowopezamiw.medianewsonline.com/mufajakejebevotoziw.pdf
    • https://kusejatakobex.weebly.com/uploads/1/3/1/4/131438299/pisamut_mozavexowiro_jefobade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c87215b7-4275-4c46-8cbb-1f2867bd4c72/power_xl_pressure_cooker_turkey_recipes.pdf
    • https://s3.amazonaws.com/pizivurapab/xozusogilekuwodatidibusof.pdf
    • https://s3.amazonaws.com/lepefi/chromium_revision_is_not_ed_mac.pdf
    • https://s3.amazonaws.com/pafexegud/brandy_songs_free_dj_mix.pdf
    • https://s3.amazonaws.com/nuvukivaxiren/melupekifake.pdf
    • https://uploads.strikinglycdn.com/files/ce3a2057-c55b-4192-866e-dbf54c9d272f/twilight_breaking_dawn_part_1_full_movie_in_hindi_dubbed_download.pdf
    • https://s3.amazonaws.com/jumedemimo/jedediwaver.pdf
    • https://uploads.strikinglycdn.com/files/9ea372e7-fb63-46dd-8d00-2a1ca2caac9d/how_to_make_a_cheap_fog_maker.pdf
    • https://s3.amazonaws.com/kaxukok/herman_miller_aeron_chair_fully_featured_size_b_brand_new.pdf
    • http://wutorokanotomav.onlinewebshop.net/59573055186.pdf
    • https://s3.amazonaws.com/lanubili/xilebebekalezukidi.pdf
    • http://povodakav.myartsonline.com/61809731919.pdf
    • http://nomamazuzut.atwebpages.com/lg_front_load_washer_wm2016cw_problems.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec49.bin
b8bfc88031a1ec33356db21e7ba13bf6e9774bbf3c2bb5fb9b292f6a60702c71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 5340 bytes
font_01_sfnt_off0000fe65.bin
1ce8567d358755a78310cb13fc750e1d44ad4f2a71adf25baebe86e6362fe7b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 10996 bytes

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