Malicious PDF — malware analysis report

Static analysis result for SHA-256 683f7d3bf9a574f8…

MALICIOUS

PDF

74.3 KB Created: 2021-03-23 22:59:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d7b30c0d3abad3cdffc2da7ae77e2dbe SHA-1: 9af6bc0af7a18576aca42966a387b50432028436 SHA-256: 683f7d3bf9a574f8b0dcfe8dbbf6bc9c825f3659c169a02de30b8a2ed7195e37
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure strongly suggest a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://seumenha.ru/123?utm_term=stacked+bar+graph+google+spreadsheets PDF link annotation
    • https://malosana.weebly.com/uploads/1/3/5/3/135323031/nemifapujolokijol.pdfIn PDF document text
    • http://b4shop.icu/hbs_760_pairingk3ziw.pdfIn PDF document text
    • https://danuredotur.weebly.com/uploads/1/3/2/8/132814989/noxobodixexi.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/85728481578ruq3z.pdfIn PDF document text
    • http://instasurprise.online/making_money_on_twitch_vs_youtube8c9xz.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/9ggE1wL/bunanoraf.pdfIn PDF document text
    • https://cdn.sqhk.co/madosodu/h16Rhay/premier_league_fantasy_football_gameweek_6.pdfIn PDF document text
    • http://deemonatrafik.xyz/82853648592f0cjn.pdfIn PDF document text
    • http://bulasige.iblogger.org/samsung_smart_care_vrt_plus_washer_error_codes.pdfIn PDF document text
    • https://vezudoki.weebly.com/uploads/1/3/4/3/134320633/sesewu_galawod_wunusagajiwafil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_113559e46f964172a380dcf89e1a70d8.pdf?index=trueIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_defa58bfbf534260a15f415a0a88abe0.pdf?index=trueIn PDF document text
    • http://dopugidov.rf.gd/jokafajuxaseno.pdfIn PDF document text
    • http://kuwemujureza.epizy.com/kijogo.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_7c54d73b960c473bbcded7b987349e25.pdf?index=trueIn PDF document text
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_59928b488f494e809388496528a80e92.pdf?index=trueIn PDF document text
    • http://sabukizazuse.epizy.com/busisutej.pdfIn PDF document text
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_d208dfa3a53d42fd98a179e10fb4aad9.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_8f10c1be4d614784a801fb21e71c3525.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_b8268405cdd041889a1127ceaf38c465.pdf?index=trueIn PDF document text
    • https://e8802323-0824-40c5-8a58-19d700e27586.filesusr.com/ugd/50cafd_bcb9b788269d4a129791f285518a3e95.pdf?index=trueIn 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_off0000e374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE374 5640 bytes
SHA-256: 9936776fa63b241cf55e8ac5b5af2f0b609251f1651124a52ae7928270a19df8
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 11308 bytes
SHA-256: 44aa351ee8d546c2d20aa7cd96c6f28a2d78d839b0077cbaec418a4a8e2523cd