Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1549ffbb3f93c7…

MALICIOUS

PDF

70.8 KB Created: 2021-01-06 07:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 07a96f6116798e9fe06eb2b94ffba307 SHA-1: f28d717d9d92b4c105d5e190b83a42f5fca94188 SHA-256: de1549ffbb3f93c7cc3c88a23d19d87a4b459fb5078fcd8a00947d4b4cfb94fe
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least two identified as malicious redirectors. The document body, though heavily obfuscated, suggests a lure related to a 'Wow addon decursive guide'. The presence of malicious redirector links and the ML classifier's high confidence score indicate a phishing or redirection attempt. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffine.ru/aws?utm_term=wow+addon+decursive+guide In PDF document text
    • https://sizojupitad.weebly.com/uploads/1/3/4/3/134332657/tadim.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/lefuzixezuno.pdfIn PDF document text
    • https://fapadeli.weebly.com/uploads/1/3/4/4/134445247/sefawu_xotularaxefaw_simozebawiw_xuvujeniwegabu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5fcfb2ba67e18.pdfIn PDF document text
    • https://neritakewu.weebly.com/uploads/1/3/1/8/131856632/babelosulowixo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402938/normal_5fcc795a76829.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/xSyhiji/raspberry_jam_without_pectin_or_sugar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445743/normal_5fdc462c23c15.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/farezelof/negavisilati.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc06e9b-3252-49f2-9fcd-d863a6cc1564/nonafubutowifaxezam.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/chopsticks_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2da1e86-85b9-4329-890e-7c2305db67f4/nubuxuwozugupideketixe.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/vavokuvegijepikawuzafow.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_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 5240 bytes
SHA-256: 423055f45dc7132322fe37f418e7e3e99accbcda630499c217e6c04a3c169b66
font_01_sfnt_off0000e948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE948 11076 bytes
SHA-256: 4b1f1f1edd839f8c94de8950408866c704ceae9b6abf5d6f092bc961625e2d35

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