Malicious PDF — malware analysis report

Static analysis result for SHA-256 4856f4265629b5fc…

MALICIOUS

PDF

91.8 KB Created: 2021-03-23 13:26:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cd198cb26e115c7b305bc1822fee8202 SHA-1: 73166cdc0f51d2594c2f2b786696585244851733 SHA-256: 4856f4265629b5fcb06277484d71af3401c0645f8d5703a72bbbc85144cd0890
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://botokaw.ru/strik?utm_term=how+to+read+a+standard+normal+table', is suspicious and likely leads to malicious content or phishing. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=how+to+read+a+standard+normal+table PDF link annotation
    • http://mipamuwupo.22web.org/demuluvogizevajug.pdfIn PDF document text
    • http://memexeti.66ghz.com/5929419771.pdfIn PDF document text
    • http://vowebipuse.22web.org/bblia_catlica_online_pastoral.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_13c896cfaafd4c1f9b6c4fdd03e18dda.pdf?index=trueIn PDF document text
    • https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_372b230620c64a1d8420a64016bf54f2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eaaa28d-be17-45b2-8001-bbd6deadb731/cummins_diesel_engine_diagnostic_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6162a7c-080a-4c84-9a11-207a856b51f5/watchmen_full_movie_hindi_dubbed_download_300mb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94799c0-c7ae-47af-b0a4-06b25c7f73d0/sims_3_merge_cc_mac.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_a47f915a30234592acc9795fc59a92dc.pdf?index=trueIn PDF document text
    • http://fuxewon.epizy.com/79151808098.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_928a863e5e5d453bbf0295d61ab178d2.pdf?index=trueIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_d2b02cab07d04ce5b23acd43a8520834.pdf?index=trueIn PDF document text
    • http://bafajomagiguva.rf.gd/what_is_the_book_everything_is_illuminated_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28f4b7c-1673-4747-824a-17193e76f0fc/bijipoxopevi.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_c11b026881e140f68e83baae5d78c3ad.pdf?index=trueIn PDF document text
    • http://gasikogo.rf.gd/77137875459.pdfIn PDF document text
    • https://7fd9f749-07b0-48f8-ad51-68075edef824.filesusr.com/ugd/197648_23941a4cebd64493b4c88bc8d3604208.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_0c8e122aff5b4c25814068f0f8a596b0.pdf?index=trueIn PDF document text
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_28de91ce0736411c8dab9b955ff10499.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_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 5164 bytes
SHA-256: e83d49788766ef2a5a8b14028de0b4ec1039d33f2fd794c9dcd860986ab91e3b
font_01_sfnt_off00013abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABF 11476 bytes
SHA-256: 664f02ed7ea3fcef2bc662187e1a6b18faec779222755e0c2d5df0a7a8b5b920