Malicious PDF — malware analysis report

Static analysis result for SHA-256 6178d1de66e38be5…

MALICIOUS

PDF

77.2 KB Created: 2021-04-06 01:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 706d1c86977811a0f2f305eaabae236a SHA-1: 55a92f70a3a20fb41cd21f64132ca0942a978637 SHA-256: 6178d1de66e38be570789db6c8fb3206ab7ab8f12bc7111fdf433e37ce72fb3a
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a common tactic for SEO spam or to redirect users to malicious sites. The primary URL, 'https://druttle.ru/wix?keyword=pk+song.com+a+to_z_download', appears to be a keyword-based lure. While no scripts were directly extracted, the PDF structure and the heuristic 'PDF_SEO_LINK_FARM' indicate a high likelihood of malicious intent, possibly involving the exploitation of PDF vulnerabilities or the delivery of further malicious content via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://druttle.ru/wix?keyword=pk+song.com+a+to+z+download PDF link annotation
    • http://zukuwoluzut.iblogger.org/icarus_story.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/bisegilupuf/akathisia_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/53918343401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98097752-90fe-4fa3-8739-7ae1d02ca057/sukusigibeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d327cbeb-3570-448f-9dda-ecb5be948c89/how_much_is_2006_toyota_sienna_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/68301237688.pdfIn PDF document text
    • http://xekoduxunadisum.rf.gd/30881374262.pdfIn PDF document text
    • https://115777a2-cc0e-4789-9e99-30cf4bdfca1a.filesusr.com/ugd/2b3546_178d85abefc3403f85d4e9f481691beb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6dd0432-4033-48dd-99b5-3273be9cfebe/how_to_unlock_telefunken_tv_without_remote.pdfIn PDF document text
    • https://31e64076-56b3-4e53-9780-179364fbad2f.filesusr.com/ugd/d8d3cb_4cf234a8d52d47dca7ee5c6c1e5f0358.pdf?index=trueIn PDF document text
    • https://c4a0f302-b060-43a0-af10-a0364da5eca7.filesusr.com/ugd/c6d327_af6b4c10a96d4eb1be8d03f3598d1188.pdf?index=trueIn PDF document text
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_a386c2f1a76b4cf69ceb074e116780cb.pdf?index=trueIn PDF document text
    • https://49f3a523-2ddb-4f17-a073-729d67a362fa.filesusr.com/ugd/18c683_c9799eab9ebf438598b705fed96b0f3b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/14353450664.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/kamigogabo.pdfIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_465b4d345fa34f13ac6fb9c03f10f4a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/4274434480.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/icao_airport_code_list.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_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 5400 bytes
SHA-256: 4a1d73cebbb35c575bb3309dfda413c4ba7ea4f8d54da996f04caa61a16547fd
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 10304 bytes
SHA-256: dedaf741ef0eab34ab69b68a036c2ad1956a6e2344f77071fe5c9f09a93f6b21

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