Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ffddb358513314…

MALICIOUS

PDF

65.2 KB Created: 2020-11-29 09:58:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 904d1f424aa7791193113776e5ba2d1b SHA-1: 7bec11da8c7ba12b22df7524d0b29bb17dd7252a SHA-256: d8ffddb3585133147d80db6677eade16b625e670d9f2cfcf50283fc7bbf8bf80
214 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to a 'repair guide', suggesting a lure to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffking.ru/aws?utm_term=hp+envy+17+repair+guide In PDF document text
    • https://doxifivot.weebly.com/uploads/1/3/4/2/134235468/4580944.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80ad3e9-37f5-4792-affe-ea752647e27f/ualbany_state_quad_student_success_center.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/boone_county_circuit_clerk_forms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e38e869-c371-41d8-a793-f61f365edb21/gomolosom.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/hero_4_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c8f0b75-74ca-4bb3-9e3e-2c1c96991e55/20534734222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad521de-bd05-4a36-9bee-0a7bff6bf349/curtis_high_school_staten_island_lpn_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c35db9d-978d-40e3-8d25-975506244b22/zipolaxavasesozanifigivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862a0460-23af-477d-9397-3ef02f012016/59861545245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10637f71-570d-4e28-986f-146ce5631b5d/55762062832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38bb54b-7036-4c6b-9c13-cbd33edd0ef5/furedabugab.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/61689884951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1882e13f-dbc3-45d6-82c3-9baa8571e541/94675614117.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_off0000c48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48C 5172 bytes
SHA-256: 34dd01852710847a024a3e967c379d8142d232159582cb63bd62821d0d54e54d
font_01_sfnt_off0000d64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 10144 bytes
SHA-256: bff273bf9f2bbbb8575aa56b05467d866708aa9999f05a5ab67d756a5cd64dcf

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