Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c1bc3f66f48403…

MALICIOUS

PDF

73.9 KB Created: 2021-03-25 04:03:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e8c2213891fcfc2a206029522334dc20 SHA-1: 99363cc7c10d5289825e15e36dd3eaa175bbc7a7 SHA-256: 89c1bc3f66f48403cc809b7964026f2640007db90fad245483e192b3324b3638
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, many of which are hosted on disposable or dynamic DNS services, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=how+to+provide+sales+training PDF link annotation
    • https://cdn.sqhk.co/nuroteditu/jagghc6/83909700161.pdfIn PDF document text
    • https://viramerobudob.weebly.com/uploads/1/3/1/4/131483281/3356012.pdfIn PDF document text
    • http://kuviruvada.getenjoyment.net/ravished_by_the_triceratops.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/jcpKXgd/ghost_sounds_phasmophobia.pdfIn PDF document text
    • http://lobutojumakix.22web.org/82040547262.pdfIn PDF document text
    • https://bilokomomaxin.weebly.com/uploads/1/3/5/3/135397692/xokatifuketo.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/hwhhpJ3/playstation_4_walmart_controller.pdfIn PDF document text
    • http://fusobilel.iblogger.org/15474547123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_60224d762448f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415052/normal_601dbfab005a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416789/normal_5fc5bb7b93be3.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/5b6ea.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/c886b6c38.pdfIn PDF document text
    • https://xuvivodoxanujo.weebly.com/uploads/1/3/5/3/135308848/7461148.pdfIn PDF document text
    • https://cdn.sqhk.co/lesepivir/fRggjfk/40716627316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e2d284-c840-4ad2-897e-605eafd24a3c/revamesosanot.pdfIn PDF document text
    • http://saragodofoli.epizy.com/how_to_find_saved_collections_on_facebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa04b4aa-7b76-4cf8-8420-1d795463da08/72620778259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e5a62b-29e9-46ac-b6a9-6e12390c162c/happy_birthday_chatal_band_mp3_free_download.pdfIn PDF document text
    • http://bodagoge.epizy.com/sharp_lc-60le640u_specs.pdfIn PDF document text
    • http://lazuletezofik.onlinewebshop.net/and_so_but_because_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28fbb640-8449-4b13-a7cf-358758461cec/dish_network_bill_phone_number.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 5240 bytes
SHA-256: 9e701b74f6cba140f37788c6ee9f1256bcb2f343299febe5cbfffc932d64f552
font_01_sfnt_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 10176 bytes
SHA-256: df169fde65aea155cf4c3fd2642d72b9e553810a4c3e84cd3989639f55cba2b9

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