Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b83bb606e521d2d…

MALICIOUS

PDF

83.0 KB Created: 2021-03-28 09:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fe1e9c98c3c394f4dde4207942f7be9a SHA-1: c11cf48ccdf038c92232af0860b19a9b70af2ad9 SHA-256: 6b83bb606e521d2d210ef4417b4ab5776f500260f5a5dafaa51224bb04acfd4f
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, with many pointing to disposable domains, suggesting a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and external link farm heuristic suggest it may leverage embedded JavaScript or other exploits to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=a+escrava+isaura+bernardo+guimaraes+pdf PDF link annotation
    • http://puveputado.sportsontheweb.net/43749333710.pdfIn PDF document text
    • http://usmileofficial.site/dosifit2ptei.pdfIn PDF document text
    • http://zexedebamuwep.iblogger.org/95759282751.pdfIn PDF document text
    • http://gugolufixa.mywebcommunity.org/jutumadi.pdfIn PDF document text
    • https://cdn.sqhk.co/figoveraboj/jhaAif0/49498762235.pdfIn PDF document text
    • https://cdn.sqhk.co/wevamerazo/zFidhbV/halloween_dead_mermaid_makeup.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/jbjivSk/soxivolutakitifelesidon.pdfIn PDF document text
    • http://discovljzg.fun/getexotexuwabuzavexisasu97wsl.pdfIn PDF document text
    • http://menesoger.iblogger.org/89920538522.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/hgjIzge/xemive.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/estructura_texto_informativo_para_nios.pdfIn PDF document text
    • http://migerov.xyz/teoria_de_aperturas_ajedreznm6j3.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
    • http://wagasegupoveduv.rf.gd/home_security_risk_assessment_template.pdfIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_f661ccd5d8954f86aec75a1f142956ea.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_926487aa6c6c46abb662ca15190f52c1.pdf?index=trueIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_2e580ee96c424bdb95f89e1424132e6b.pdf?index=trueIn PDF document text
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_36385c46b0e44355b56dec02610c865e.pdf?index=trueIn PDF document text
    • http://nemunuj.rf.gd/wedding_cake_recipe_book.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_cbe84874b1604867956383fe9c2bc9d2.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_a1c344568ef94f428326230f7dea21fc.pdf?index=trueIn PDF document text
    • https://945c5b1a-9feb-4a08-b72d-c905ca1b1520.filesusr.com/ugd/27135d_755e76043b43490f8e9bd4a51636237d.pdf?index=trueIn PDF document text
    • https://4fd47d7d-96cb-4cdc-943f-55997d715fc9.filesusr.com/ugd/ab3424_e9d926383a7845c693c5559bde852eb2.pdf?index=trueIn PDF document text
    • https://c0a42e0f-4cce-4e1b-84a6-2a5440198d67.filesusr.com/ugd/440b6d_4c03c5f247df4e4ca20d960c0fe2abad.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 5432 bytes
SHA-256: 69bf427731d329b4e448f9e9dba684a4668db9740e2bceb6b112ba9ca69f9c99
font_01_sfnt_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 11248 bytes
SHA-256: a483759d19072b7870787ce539225f14b27f7f4195ef5506653c1ae8070364c7
font_02_sfnt_off00012e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E37 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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