Malicious PDF — malware analysis report

Static analysis result for SHA-256 d318be186a6f8a8a…

MALICIOUS

PDF

73.9 KB Created: 2021-01-15 00:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8133f2ee4a55a8849dd65ffb8fdba296 SHA-1: 78a3191088598aa33c4d90c32331aa863c40429e SHA-256: d318be186a6f8a8a36c4683f5447e2e6846f18b7c7df2388d3007d72696b6353
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM indicates a large number of external PDF links, suggesting a malicious intent to distribute or host malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or redirection attack.

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://traffset.ru/aws?utm_term=power+bodybuilding+routine+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366633/normal_5fcf47f692d3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_5fbf9fa36c9f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462344/normal_5fa78a0b93522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_5f934746b6cb4.pdfIn PDF document text
    • https://bowogemiris.weebly.com/uploads/1/3/4/3/134316512/d8c0a005897ec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_5fae624f13584.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489052/normal_5fe3b918ea13f.pdfIn PDF document text
    • https://joxetoxuluf.weebly.com/uploads/1/3/4/3/134391367/5124774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425256/normal_5f97538a9e0c7.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/accelerometer_mpu6050_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/chloroplasts_and_mitochondria_coloring_worksheet.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d098.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD098 14380 bytes
SHA-256: d97e997b12a4d76bbe076aae46d4eee91a2138da4ed7723b9d5f705f956c9290
font_00_sfnt_off0000beef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEF 5156 bytes
SHA-256: ef4cf214c2bf10d781272fcf7e904a3620f36248993d7c2abe77e629849b1cce
font_02_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 9480 bytes
SHA-256: b7372ce63c98b88831ade358d6215a2373ec931ec2a253b4d14b14d6d41e8ec9

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