Malicious PDF — malware analysis report

Static analysis result for SHA-256 7479ff69f67d3591…

MALICIOUS

PDF

105.6 KB Created: 2021-03-23 12:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2b2f657ceadb4b1da70e5794d19acf2e SHA-1: e4c2e6bf26b377d0ea50960631c0ce28992eb954 SHA-256: 7479ff69f67d35911cfc0bd12f15cac892d5f471baefc8803994bf1568309051
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one primary URL pointing to 'https://baarspo.ru/strik?utm_term=interview+with+the+vampire+lestat+quotes'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself facilitates the attack.

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=interview+with+the+vampire+lestat+quotes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4394061/normal_5fe0c27620d4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386830/normal_5fca39e666bc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_603ce44c3ad56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412891/normal_60108f6f53664.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_60010bc337163.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_5547dec5f5d64dfaac4eac1af03f9ff6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/bowalisimokazonugazigi.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_00f95b5467f349d9bfd8816415db0ae6.pdf?index=trueIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_8ad6112e2d104d71ac2b987b35888cc9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52eb96e-a0f6-4ca8-b529-b93dcfe51698/how_to_get_brother_wireless_printer_back_online.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/54939653045.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/2449029651.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_10a18009afac4ab880d0d7e92617698f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zopenave/scrabble_rules_can_you_add_an_s.pdfIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_22296e254580402b8dd610f24b5cf1e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/external_speakers_not_working_on_my_imac.pdfIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_fd0ff6a26d2c4d3ea5911293c29850c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/780440b5-1b44-4b03-99cb-5b1c4df77114/tone_up_legs_exercises.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_ca577ecae8724f4e843ce5c3c8407544.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_20749a5d12684cdd806163c7b414fda4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155ED 5276 bytes
SHA-256: b003fcc66b947eaf74a38ece04b0015ceb2d20187b6a48f3286f5ae7408bf58c
font_01_sfnt_off000167c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C6 16596 bytes
SHA-256: 9ba73875da0336ca75107b503d127e07f0b9ab68bab72b98678cfacdca23e8bc

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