Malicious PDF — malware analysis report

Static analysis result for SHA-256 51923e6bc3a9156f…

MALICIOUS

PDF

84.5 KB Created: 2021-05-24 15:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e9260048d02df48cb902331b0d4ec341 SHA-1: 1f6325ba7ba19caf01a2c9969073b41deaa76630 SHA-256: 51923e6bc3a9156fd7c636cc80e07c6d992f9f8b8ab36b7feb567ec24751145e
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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=de+lenguaje+com%25C3%25BAn+a+lenguaje+algebraico+ejemplos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457561/normal_603f5aecd6dc4.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/5753347.pdfIn PDF document text
    • https://jesisime.weebly.com/uploads/1/3/4/8/134886507/7404602.pdfIn PDF document text
    • https://xuzonikafu.weebly.com/uploads/1/3/5/3/135351414/kamoke.pdfIn PDF document text
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/2347035.pdfIn PDF document text
    • https://lafawifovetin.weebly.com/uploads/1/3/4/3/134369932/1530374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372105/normal_6047f9197809d.pdfIn PDF document text
    • https://gunajotigur.weebly.com/uploads/1/3/4/7/134738866/8370922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497110/normal_6033fc02119f2.pdfIn PDF document text
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/0f882f.pdfIn PDF document text
    • https://pubogovivewata.weebly.com/uploads/1/3/2/3/132302724/sufonipizur.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/104670.pdfIn PDF document text
    • https://mujatasibofemi.weebly.com/uploads/1/3/5/9/135963028/2984351.pdfIn PDF document text
    • https://tiriwubesunadew.weebly.com/uploads/1/3/0/7/130739346/54ee5.pdfIn PDF document text
    • https://denibizokitig.weebly.com/uploads/1/3/4/3/134340328/fc8ef20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/198d0d31-b34b-4d3b-9462-c8d3c5f770a6/46681823415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/676bed96-8d2a-4eff-ab26-bf25cde35763/62848871290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e72680e8-ad78-4127-a29c-9299360cca4d/winoxomukexejowiven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184c49e9-6df5-4122-aacf-2087ff675419/the_crash_of_2008_and_what_it_means_the_new_paradigm_for_financial_markets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4466a300-0fa0-4c19-8282-b531dcd6a345/why_is_my_panasonic_tv_not_connecting_to_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f92dcc2-8071-4e93-8241-01f722feb8d5/wodudalapanasibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/004fa2d7-0b09-4565-9d3b-7231714cf75a/welcome_to_holland_poem_part_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9326a7c-d043-46e0-a841-345f83235f12/14412158496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/752b9458-792e-4142-a98e-54cc26b925ae/kofoguzidiravaxaripe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 5384 bytes
SHA-256: b9b39321d92fe32e7ca73b307f8124b147368cce4cfda7d85de8cba199477f8d
font_01_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 12244 bytes
SHA-256: 6204a5ead282b3d21690835ae0efd3f1f37ea898171b1ecefeabc9ab87d08aa4
font_02_sfnt_off000133d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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