Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2ad895dfa172c7…

MALICIOUS

PDF

89.3 KB Created: 2021-03-16 23:19:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bfe91d2a80b9f0411af31ec5c9c6138 SHA-1: 71ab770cf603ef446b55c63f55a60c05663b9315 SHA-256: 7b2ad895dfa172c7e1f2ed9680d2a424c6577384b34688e994a6903a4951cf9d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/123?utm_term=baja+autoestima+y+depresion+pdf
    • https://cdn.sqhk.co/vixemujomu/i1tfugc/escape_alcatraz_game_library_solution.pdf
    • https://zoninezazazi.weebly.com/uploads/1/3/1/0/131070362/6584151.pdf
    • https://cdn-cms.f-static.net/uploads/4493891/normal_60217d7125e2b.pdf
    • https://cdn.sqhk.co/nodewanase/cicI55U/directv_vikings_game_today.pdf
    • https://cdn.sqhk.co/nupozifulija/hegjgfO/chocolate_cake_recipe_easy_moist.pdf
    • https://cdn.sqhk.co/widexerun/j0Fe2hj/nfl_game_scores_and_standings.pdf
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/kedeniduvog.pdf
    • http://cmbespaceclient.xyz/270407670419pxx7.pdf
    • http://laxana.ru/pafigogopebavikomodaws2zkr.pdf
    • https://nedugapepo.weebly.com/uploads/1/3/4/2/134265444/kazidonav.pdf
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/1090598.pdf
    • https://tuxabonelunod.weebly.com/uploads/1/3/1/3/131379680/510740.pdf
    • https://static.s123-cdn-static.com/uploads/4369928/normal_5ff93ce762413.pdf
    • https://cdn.sqhk.co/tosilura/hdgdfEj/duvoguvezagowaxo.pdf
    • https://cdn-cms.f-static.net/uploads/4482618/normal_5fd1452418cb5.pdf
    • https://cdn-cms.f-static.net/uploads/4489844/normal_60223394602e7.pdf
    • http://allostar.buzz/krueger_sheet_metal_wau69wt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/df6a49dd-316b-483a-95ab-9b05d3a0f35f/how_to_set_up_my_universal_rca_remote.pdf
    • https://uploads.strikinglycdn.com/files/85a1baaa-41da-4586-95e7-dd1dfb5967cc/99602992530.pdf
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_81a22e8ec544480cb169e30a441cb18e.pdf?index=true
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_1a24e290ec0849cba467eb84127e481b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1c39249-20a8-4064-b516-f927072e589a/12176556723.pdf
    • https://a181bb3e-7445-4f1f-a1cf-b2fe66c13e92.filesusr.com/ugd/91ce54_18b1494069394174ab1d397a26e65dd9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120cc.bin
ba32dbf50662591eb8103c6576089c15494354337f1584c0b9c835ab44f9be13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 5380 bytes
font_01_sfnt_off00013314.bin
a26cdd06c92c31ae12dbd146dee9d98a4c88cab95be1873f4b929a2bb620a3dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13314 10760 bytes

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