Malicious PDF — malware analysis report

Static analysis result for SHA-256 0644f49172cb9b41…

MALICIOUS

PDF

54.5 KB Created: 2020-11-06 00:54:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 99b8cefcc9c330293dac27594f0d7d44 SHA-1: 5b2c44cf34143e360597c73e5409cf932e2efb5e SHA-256: 0644f49172cb9b411c9801188afa94e02abe9f6cf706903350dba5c0fd6002b3
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trafffi.ru/123?keyword=manual+for+dynex+tv+model+dx-26ld150a11 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450870/normal_5fa19edc4128c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_5f985b572068a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5fa3801063fd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413465/normal_5f95e1cee348c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387922/normal_5f98a7baeceb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_5fa47fa5b45fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f8f78606733a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_5f9e3e014f7dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404725/normal_5f9ec8685a2ff.pdfIn PDF document text
    • https://xetutinafo.weebly.com/uploads/1/3/0/7/130775845/xuruxukijisized.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379237/normal_5f9cf4c093cc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5f91e121d18d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba41fa5-9062-4c68-ba72-47dcc8335f70/dayz_standalone_free_download_full_g.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a57e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA57E 22492 bytes
SHA-256: dbb45ea3d808977b1975030d85eacae310fe509e141fed6d0135d16049e18803
font_00_sfnt_off00006be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE3 5744 bytes
SHA-256: 7017a2240ace175962de0d773b570d52901e124f530e14aef23d999972e58111
font_01_sfnt_off00007f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F91 11124 bytes
SHA-256: a9b5591a0f4959c3e258715399f23d8713f8ef0e07afa30aff0e247f7aebe31b

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