Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d90e66773711da8…

MALICIOUS

PDF

92.3 KB Created: 2020-12-04 09:09:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2f02168377837ebaff1c9805a99b8c20 SHA-1: 9cb40a86c4fa0d32c7ba7298843dbd397e0ae3ed SHA-256: 6d90e66773711da8231296f24840f199ce10b948bbfe77c6d260f00908bf7a20
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, pointing to various PDF files. One of these links, 'https://trafftec.ru/strik?utm_term=nativism+apush+1920s', is flagged as an external URI. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/strik?utm_term=nativism+apush+1920s PDF link annotation
    • https://pibusabet.weebly.com/uploads/1/3/4/6/134695111/4304159.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/rokuwapesu/givedifixokijageviporuvux.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/92489169073.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/10029262432.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/54075897551.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc32334ea4a794d5653bf07/t/5fc6d149e2dcb1274ddb9ecb/1606865226708/diy_mask_lanyard_chain.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e80068612547ed5e2b99/t/5fc16feee6d49a06bbc8a25f/1606512623092/times_interest_earned_ratio_calculator.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/liwakelabojozi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc371da40f1034a5cb9132c/t/5fc6f27a1d106d256bb5b9bd/1606873723505/history_of_english_literature_romantic_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5584718c-889f-4ec9-ad81-8dbfe8d1885a/29922248596.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/warus.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66c8a8ef7301f8b36d770/t/5fc9d88a9bc93d20d9b0521a/1607063691293/luliwiwusatetesupe.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_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 12088 bytes
SHA-256: e434426fb10d1d0ace46930e66e3720933a4d9de93f0dd75f396965c5b83f4c9
font_01_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 4992 bytes
SHA-256: f66874ef09999ccfd5b910b2a4372987871c158009bf7911e8f36d698429d5ab
font_02_sfnt_off00012df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF3 11316 bytes
SHA-256: 07d779e07e05bb40f0be39e323ced002df82b9147a160cb7d69bb3561208cd5c
font_03_sfnt_off0001549d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1549D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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