Malicious PDF — malware analysis report

Static analysis result for SHA-256 145d719c75cb65e4…

MALICIOUS

PDF

71.1 KB Created: 2020-11-18 11:56:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 50e99c0e48e26b7942f02df189c84193 SHA-1: 1485916c8930cd3e5453695e54d5cd2d733b6ea8 SHA-256: 145d719c75cb65e45f5339fb63702076c5bf2486901553ace7d670c94bcf3ac6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of many external links suggests a link farm or phishing attempt, likely intended to lure users to malicious sites. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ggtraff.ru/123?utm_term=vacuum+forming+table In PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/gajazagijorejof.pdfIn PDF document text
    • https://sakenudawajaka.weebly.com/uploads/1/3/4/5/134595508/5228216.pdfIn PDF document text
    • https://tefidimigeb.weebly.com/uploads/1/3/4/3/134319466/8418895.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://s3.amazonaws.com/zirojopemup/ecological_economics_book.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/44898354055.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/walmart_careers_sign_in_page.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/i_genetics_solution_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/bad_fuel_pump_check_valve_symptoms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934c6eb0-bcaa-4cda-8bd7-3134babf002d/don_t_starve_together_crock_pot_rec.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/52403057358.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/philippine_consulate_houston_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9cc4f6-1f7b-4e7a-8867-14045a0ccf6b/94541141932.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F9 2960 bytes
SHA-256: 3c6502e04658d985b37ed967139d4b1bb7136c1c8ff06868e6b64c17630b7d50
font_01_sfnt_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 5008 bytes
SHA-256: 2b26ecb9ca18e8d4e6eb4a73630bdae1f32795d78e611ac6c507b980098335cd
font_02_sfnt_off0000df70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF70 9864 bytes
SHA-256: a5a2c8c78640590a6f72492c6648d1224326ffa9493a7b63df44bcfe667f2ad2
font_03_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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