Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a07b852f0a5b7ac…

MALICIOUS

PDF

83.6 KB Created: 2021-03-25 05:26:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 93962ff2fc55f7c3ab83fdc90b7b9e40 SHA-1: 080624a860c89630367b653aa215971fcb98e495 SHA-256: 7a07b852f0a5b7ac30dd6dfdf0c0f29d8ef92a2c057665fee2f3067e0aa7018d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous external URLs that point to other PDF documents, likely for SEO manipulation or to distribute further malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious sites or to obscure the true nature of the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xajibur.ru/award?keyword=matlab+basic+programming+tutorial+pdf PDF link annotation
    • https://cdn.sqhk.co/seranowe/k43xhcJ/xexobujevolasag.pdfIn PDF document text
    • http://metiwizonud.getenjoyment.net/abstract_algebra_a_first_course_2nd_edition.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/how_to_graph_a_circle_on_a_ti-84_plus_c_silver_edition8zjps.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuneduzib/5XUhfwZ/alienware_laptop_deals_black_friday.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473432/normal_60562dd229b56.pdfIn PDF document text
    • https://cdn.sqhk.co/bulamije/vghjPvS/ivan_the_terrible_facts_ohio.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/19740519379.pdfIn PDF document text
    • http://securespot.ru/how_to_get_lifetime_rewards_sims_3_cheathlvgl.pdfIn PDF document text
    • http://blacklaser.ru/what_is_the_operation_in_afghanistan_called_now74z0x.pdfIn PDF document text
    • https://cdn.sqhk.co/sewiboveso/igBoDjc/kavaxawutufebud.pdfIn PDF document text
    • http://easy-money-cash.space/how_much_is_125_grams_in_cupsltc6i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470220/normal_60388b0aaa9ba.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/gehjihj/kefipizufojefex.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/tegumuxame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_594f62a1003e4401a631512904423e7a.pdf?index=trueIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_7af73e99a31142979e15ba22572c7133.pdf?index=trueIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_54124f28c5a1436b8a146045299e3914.pdf?index=trueIn PDF document text
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_07ac04f9f32a448caff043ec1c4853b1.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_db5ab7707efd401892eb31ca918858f5.pdf?index=trueIn PDF document text
    • http://donijexufenu.onlinewebshop.net/dragon_age_origins_companions.pdfIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_198f78bd0a444d829ffa4aca1155904d.pdf?index=trueIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_5e13e06b15a74fd590592f53f3fac105.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_b675af82e35c47fab2f637454b6c5c1e.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_69e0b10da51649ad8a872ed2e1191256.pdf?index=trueIn PDF document text
    • https://06e27459-8a58-4d01-a48e-f853eab966f6.filesusr.com/ugd/55f1a0_e9361ca233ad4f73adf91db8cc2a43de.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_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 5620 bytes
SHA-256: 9c10e90a06dd5a7e9e64273d5145eea6d8ce2686255781fa664e376ee1f91f5d
font_01_sfnt_off000119f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F4 11188 bytes
SHA-256: 1b6b07271b7b433279cd2eb6586e00eb8eca0caf5f41c2d2b90d62415bcb3d6a

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