Malicious PDF — malware analysis report

Static analysis result for SHA-256 153e3fca6607b14b…

MALICIOUS

PDF

76.7 KB Created: 2021-03-25 09:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 713a529836ea8eaacb20f8641f9c1321 SHA-1: b3b253c526fc8c40629d3e237b3fbcb0522db78c SHA-256: 153e3fca6607b14bf2eff11c0a9dcca07ec69cb64c96b3427e0237ba9ef6154e
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs pointing to disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern of using numerous links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://druttle.ru/award?keyword=cellule+animale+sch%25C3%25A9ma+pdf PDF link annotation
    • https://cdn.sqhk.co/vadetegubufo/mmihjjh/another_name_for_b_52_bomber.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393900/normal_5fc56fb0269bd.pdfIn PDF document text
    • http://sidazolomaw.22web.org/22619714201.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447101/normal_605c34a95fbdd.pdfIn PDF document text
    • http://duduzojezojak.22web.org/87253373418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393183/normal_6056ea8b2b43f.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/dig1lgg/dizotox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_85e6bbbd1f17488ab7b8a58edcf20c17.pdf?index=trueIn PDF document text
    • http://sibubixusa.epizy.com/efftronics_written_test_papers_with_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/86615465220.pdfIn PDF document text
    • http://wosamufudov.epizy.com/fuvalamelukekogu.pdfIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_70492031c1f64b9592abb6413c18c6ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de06631e-9b9c-414e-a971-0a1fa5f89ff9/tumajagavav.pdfIn PDF document text
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_5276b2c3593b48448f06010efaa1a434.pdf?index=trueIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_29b6e34842df44b3b6525be18b7fcb87.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/07de0421-9235-4405-bb8a-32391563a461/how_to_change_staples_in_one_touch_stapler.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/44892932558.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 5344 bytes
SHA-256: 7b54279b67260d49588593374ab788682a88cbdee72a748e76a4caff4c384429
font_01_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 12220 bytes
SHA-256: 6538c749516a4980598496c29afcbcea4d56e3fad93264e7c2a8b64129d869e3

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