Malicious PDF — malware analysis report

Static analysis result for SHA-256 58e520d5e63d4ab0…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 22:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9ad4d757972f3ef25c0ffedbfb5a6269 SHA-1: 32ee651a4acf086551454f484d7873e2ab7415df SHA-256: 58e520d5e63d4ab0d333e4bf802a1518b536e9b7fd034c63c0a2c67a662d4d6a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The presence of a critical heuristic firing for 'PDF_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/123?utm_term=add+character+sheet+to+roll20 PDF link annotation
    • http://dontbeshy.xyz/16746556259ipjky.pdfIn PDF document text
    • http://khareedforosh.com/image_to_video_movie_maker_android_github5crzb.pdfIn PDF document text
    • http://taygerr.com/used_book_48_laws_of_power9qkcg.pdfIn PDF document text
    • http://shoop-fp.ru/426205451756pbm8.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/18c49ef5-7135-4a8a-964d-393f924da5c7/why_is_my_hoover_steamvac_leaking.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_e52cff4bca2b4533a08220239f6bd640.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebecae98-a97c-4c91-a5ed-c9946b091e88/41694247004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fc2a46-7f8b-4d8f-b3c1-1a2b8c39e11c/how_to_calculate_power_across_a_resistor.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_3baa047b9e6e4fd5aaead28a9288a415.pdf?index=trueIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_dc42dac62016493ca5748513279f4ff6.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_aabf6cf71afd4b54ad9ac37ce275da5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc5c458-3145-46f3-92a5-829f24fdafe4/61778117194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c96ecc-4731-4f84-80fd-2157ef7d2bc8/ti-82_stats_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/kagenukesaza.pdfIn PDF document text
    • https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_ddbea44d87204be2aae4c2dc777279bc.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_51d37c82192a40128f2e899f41ec149c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/how_to_check_220v_outlet.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_f2e7ba518fef4814ab0a3986135e5442.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobito/basic_english_words_with_meaning_in_tamil.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_e0187e00a3b2458d9d59fcd6a4c2e97f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/unsquare_dance_dave_brubeck_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/dangerous_fellows_ethan_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3343057-b95a-441b-a968-2ce17c90d790/nelsons_ministers_manual.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_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 5288 bytes
SHA-256: 62010a61b845ebf343dd40b08277de41a9d05e7d25db076a504025be975dc06a
font_01_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 11632 bytes
SHA-256: ad339c47f80c9a1b720ee8648ddcc7c345a50926c5c2face6ab3355a2db0b8f6

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