Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ce3517aca277dd…

MALICIOUS

PDF

75.5 KB Created: 2021-03-11 22:35:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 99789e659369bebaed0f29fa1bc68382 SHA-1: 6c49a20b1f1321c5e1b96c66aa40f3ffa4a07660 SHA-256: b1ce3517aca277dd43da212ae08727582faa94b439d2d4b966d1a6b7cacc643d
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with a notable heuristic identifying it as a link farm on disposable hosting, specifically pointing to 'http://com-connexion.xyz/xozatolowezetonejegadimarwibd.pdf'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a lure related to 'handwriting paper template for first grade'. The presence of embedded URLs and the link farm heuristic strongly suggest this document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/123?utm_term=handwriting+paper+template+for+first+grade PDF link annotation
    • http://com-connexion.xyz/xozatolowezetonejegadimarwibd.pdfIn PDF document text
    • http://kfcrabota.ru/what_is_psychoanalytic_theory_in_literature4oy9i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387428/normal_6034460970e57.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/khcnHhz/petrolia_isd_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/hichdib/check_walmart_money_card_balance_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380384/normal_5fdafe161fa92.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/what_type_of_oil_does_lexus_rx_350_use.pdfIn PDF document text
    • http://giocodigital.space/canederli_vegetariani_formaggiov4y16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_6002d67ed9438.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_602500914b431.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/how_long_to_cook_sweet_potatoes_whole.pdfIn PDF document text
    • http://liketime.fun/26236313564wkhpi.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/91c2e01c-2d73-4ea8-b7b6-4f8f4a9468f7/kn_m3_to_lbf_ft3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf08a46-a144-4c32-99e9-c7f4c75c0ddb/las_medias_rojas_emilia_pardo_bazan_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc495892-52f0-44cb-9616-65f9cd5c55af/my_samsung_tv_switches_on_and_off.pdfIn PDF document text
    • https://4a7d9d2b-1d67-446c-8d6d-bdd3043d1f60.filesusr.com/ugd/c3d078_c2f04eaf6a4f445da7d497fc53fd6f2f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab220a8c-952c-4826-af7f-34ffbf895e74/54381059644.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_681ddc7d9cc840949225015e97adf668.pdf?index=trueIn PDF document text
    • http://wovibojo.onlinewebshop.net/dodevurorutuzelarakuz.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_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 5416 bytes
SHA-256: d4db17470ff4c96446cc35cd35f18dd50792a8fadb183c20721f7923ef529652
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 10712 bytes
SHA-256: 8360f79a4c0fdae1c496487c90b71e71e35f30621fedece1efcbee72076be54f

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