Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c08df9fed0054d…

MALICIOUS

PDF

81.7 KB Created: 2021-03-09 23:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2e6468be64275e059c77780a40e125f9 SHA-1: 9a364e22c831c9ad564a3873469bc1c9bfd6155d SHA-256: a2c08df9fed0054d9f4e1e9edb059c13c1adaf7611dc4547622439543d856edf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/award?keyword=appareil+respiratoire+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463532/normal_5fe3ef65def3e.pdfIn PDF document text
    • http://fabermanufacture.ru/amazon_prime_now_whole_foods4zjwe.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/8x0hgii/nvidia_geforce_games_download.pdfIn PDF document text
    • http://molotkov.site/bobiribobkj22b.pdfIn PDF document text
    • http://tanifulumu.iblogger.org/sulusiz.pdfIn PDF document text
    • http://disclosures.space/92352017483f1k52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_602874e09f863.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/jjkhcl5/14595964962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487007/normal_5fd61dfc14f7d.pdfIn PDF document text
    • http://italy-small.space/brisingr_book_online_freehfbk8.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/ibjijeF/41990096928.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368500/normal_5ff918df57392.pdfIn PDF document text
    • https://cdn.sqhk.co/fupokonabat/jcoHgdh/nabofozef.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/f0U0FMI/skyblock_wiki_hypixel.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/geTsjgo/funny_images_of_cats_with_quotes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493905/normal_602ea03ee31b0.pdfIn PDF document text
    • http://8bitbeardsco.com/portable_tyre_shredding_machines_for_salew0lq4.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/aF9HibH/wipefugemazuvotafukatuki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_93da167ba1674557874d0583f55b2b09.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_a8a9dc82fdf14fdba784ba036422b5af.pdf?index=trueIn PDF document text
    • http://numivonef.rf.gd/uc_browser_mod_vpn.pdfIn PDF document text
    • http://jinesiwi.epizy.com/external_cladding_sheets_bunnings.pdfIn PDF document text
    • http://xivanokajeze.epizy.com/61998441895.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_b84c81a8bc45471a9026cf8497f42914.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_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 5024 bytes
SHA-256: 66e20a8162d36d11f4d68319b8ba46ae7c731fd111708b3e470f0687bc558a9a
font_01_sfnt_off000111a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A3 12064 bytes
SHA-256: 397536a73134f34dd0288debd75c5c3ea47f6a49b12ff4abbc4ef8a3c3f257ef

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