Malicious PDF — malware analysis report

Static analysis result for SHA-256 7028993da47bb4e2…

MALICIOUS

PDF

89.0 KB Created: 2021-06-07 01:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cab142f35ece1d17fc41e0efe3cc2a84 SHA-1: 920a825cbee1bb680444eb425883e54015f23528 SHA-256: 7028993da47bb4e2e721d13f7922246733c3bb285afc762e4f312e3ffde88b91
186 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/pbw?utm_term=how+to+choose+valuation+method PDF link annotation
    • https://peniwomafases.weebly.com/uploads/1/3/4/7/134705361/lepagobilugi-widukujedexatu-kosumureg-foxupegopukuv.pdfIn PDF document text
    • https://pedidifapa.weebly.com/uploads/1/3/0/8/130874671/radajule.pdfIn PDF document text
    • https://vatelepetelijul.weebly.com/uploads/1/3/4/7/134765631/wofesafiduti-mepulew-jupenumo.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/6840515.pdfIn PDF document text
    • https://suzibosefibowu.weebly.com/uploads/1/3/4/8/134883218/jatumito.pdfIn PDF document text
    • https://gaxipisida.weebly.com/uploads/1/3/4/2/134267022/1309470.pdfIn PDF document text
    • https://fusemikak.weebly.com/uploads/1/3/4/6/134649426/kivuwezejuwugog_xotumu_jixuxaxejedezo.pdfIn PDF document text
    • https://mejuxubewa.weebly.com/uploads/1/3/4/0/134041058/e562a75ee.pdfIn PDF document text
    • https://rituvusuxokit.weebly.com/uploads/1/3/5/3/135300238/2774884.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/e5fca83dfda4.pdfIn PDF document text
    • https://xuwejemeluk.weebly.com/uploads/1/3/4/3/134314543/rukigef-gafimarol-nowiravu.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/bigoxesopugorolilega.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/39a6f017da903f.pdfIn PDF document text
    • https://luradubesi.weebly.com/uploads/1/3/4/4/134486829/5326117.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/5963108c0.pdfIn PDF document text
    • https://tufubigin.weebly.com/uploads/1/3/1/4/131453284/2079333.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/036615f9-1bdd-4ea5-8ac9-af835ac748bd/86293307988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650e9bf8-1ba1-4503-a787-b05231651bbd/55883973859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/191111a8-f003-4a05-bfee-e61143da1518/the_new_case_for_gold_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc338726-4454-4144-831b-9438fa857fe2/percy_jackson_tv_series_disney_plus_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad98666d-97c8-4d61-b455-2ae7a018d000/how_to_replace_sump_pump_in_crawl_space.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/lines_composed_a_few_miles_above_tintern_abbey_summary_by_stanza.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144413601/43499665926.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 5080 bytes
SHA-256: 79bc8e2e89c0d13a726a9cf2ac832fa3f4c3e2c5ad9046e48491339d853b91f7
font_01_sfnt_off0001206a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206A 11540 bytes
SHA-256: 877ab83688bbff06e7c18a472961e39552f61fd5976261574d06d2958fb9f592
font_02_sfnt_off000147d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D9 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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