Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb66b3a5d32fc5f…

MALICIOUS

PDF

63.5 KB Created: 2021-01-28 10:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a45ff77084c18271d1465db5e7c3c952 SHA-1: b051c173ba4ae610cf19766da7a54abd93c1fcf2 SHA-256: 3cb66b3a5d32fc5f6a261bdba16e4ec6f0e9e408b7cc264b543171b70be62fc1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to link farms, indicating an attempt to manipulate search engine rankings and redirect traffic to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=interpreting+graph+worksheets+middle+school In PDF document text
    • https://budoxaku.weebly.com/uploads/1/3/0/8/130873914/c9e9546f3fda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367921/normal_5feb067c75d88.pdfIn PDF document text
    • https://wavimukuwu.weebly.com/uploads/1/3/0/8/130874629/d4ac1e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420019/normal_5fde21a216af1.pdfIn PDF document text
    • https://dawoxojukuput.weebly.com/uploads/1/3/4/8/134890950/7eff092b96bf.pdfIn PDF document text
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/2621493.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473656/normal_5ff125802783c.pdfIn PDF document text
    • http://barisetufor.66ghz.com/69173575534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493920/normal_5fe0f313bf204.pdfIn PDF document text
    • https://latifaxegorur.weebly.com/uploads/1/3/5/4/135400737/7360965.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vawoginele/adobe_air_swf_player_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/free_antivirus_smadav_2017_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/overwatch_updated_world_guide.pdfIn PDF document text
    • http://pesuvomekujidi.rf.gd/dewodebiriluxofemu.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/indian_gmp_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/46299381790.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/civil_engineering_cv_template_free.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_off0000bac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC3 5580 bytes
SHA-256: 19b5e550bf6f1526d9545e2657f00e81ccc06948560ad395f24423060e31d92e
font_01_sfnt_off0000cda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 10396 bytes
SHA-256: 21ac08f15b47d4859b348de2f88569d8073a725937e9cca5f17b51d40e9c821c

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