Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb61506d55218858…

MALICIOUS

PDF

65.4 KB Created: 2020-12-28 20:36:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 57697b5dcb7c33772c8a5cbf6dabeade SHA-1: ea3150642ec38a95d0bfaab012931936353297ab SHA-256: fb61506d55218858061978961312b8223c142bac19aff19de62d351f3e7a1647
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Archicad 18 tutorial video'. The presence of a link farm and a critical heuristic firing for malicious redirector links indicates a phishing or redirection attempt. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=archicad+18+tutorial+video In PDF document text
    • https://wotipufa.weebly.com/uploads/1/3/1/0/131069738/7404280.pdfIn PDF document text
    • https://turamuko.weebly.com/uploads/1/3/4/4/134458704/narabatetotomer_bugefagobola_gilowuxakapi.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/9OLijIu/wuxorowumos.pdfIn PDF document text
    • https://fufijejelido.weebly.com/uploads/1/3/4/3/134351462/fipepiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5fad5131811f0.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/hWifghe/viwebetixobafuzuwewuso.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/36b42833-cbc6-4db8-9958-2b931c3e93a5/what_do_you_call_your_dads_cousin_wife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6300c7a7-0248-4e67-90a8-2a2e27c50acf/15759607529.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98ae23a-e429-481a-995b-eb87d076363f/libumuzawudamiwosisafun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c186db1-80ae-4881-bb03-b45c9ab6896b/notary_test_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efbca53-1a2a-4930-a661-e5bbfa121e9f/que_broca_usar_para_machuelo_de_1_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665d6471-d0e3-4661-991e-2cd59bc367c7/bdo_failstack_spreadsheet_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/fur_elise_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d381a8a-cdd1-48ba-9722-c7bbdcb75356/hidden_spiral_staircase_minecraft.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_off0000c4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C4 5144 bytes
SHA-256: 63e243c4c68b831bebac32ff0857e074a25f2ee95da008c35493e4225329ba6a
font_01_sfnt_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 9824 bytes
SHA-256: b3ace0b64710b99d05a987d043565d3150ec06452b8a1c4fbe59d04727cce63a

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