Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ad373c154c5b78…

MALICIOUS

PDF

66.8 KB Created: 2020-04-05 05:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3142dd37508f4f261a8d18e10d085bfb SHA-1: 351deb03e9dd9bcc5e8a805479b9bab0edd08e33 SHA-256: 86ad373c154c5b78f3b2677900e1333c8543d6268ab6503d90f240da6cfb21ff
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains URLs that are also listed in the extracted URLs. These links likely serve to direct users to malicious content or for SEO manipulation purposes. No scripts were extracted, but the presence of numerous external links suggests a phishing or content-luring attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://onderdonkplumbing.com/uploads/1/3/0/4/130488121/130488121.html#metabolismo+de+calcio+slideshare
    • http://thedaveorsborn.com/uploads/1/3/0/2/130289410/809acf71b0f70.pdf
    • http://washingtonparkfamilyinsurance.com/uploads/1/3/0/7/130776356/woguzilafowojaj-sakiwisusetosu.pdf
    • http://sanctifiers.com/uploads/1/3/0/4/130477566/e2404adcdf97.pdf
    • http://momlifeeboutique.online/uploads/1/3/0/4/130435771/wimet.pdf
    • http://rnecarpool.com/uploads/1/3/1/3/131380934/2636644.pdf
    • http://pressurewashingtorrance.com/uploads/1/3/1/3/131383269/91627470ae72.pdf
    • http://lovegan.shop/uploads/1/3/0/6/130605443/bovezud.pdf
    • http://baiottolaw.com/uploads/1/3/0/5/130590353/fimazasajazakur_xikupawomaja.pdf
    • http://jennifertuder.com/uploads/1/3/0/7/130738711/zizisiveva.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e0.bin
68c6ed3574153a67647188143abd1635ea557438288801f2534dceba01eac7ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E0 1972 bytes
font_01_sfnt_off0000cdf3.bin
9abf49e57ad97f01cb34aeecd23b1f67205b14581cf8cb1a02d3c4030b4a0162		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF3 10008 bytes
font_02_sfnt_off0000f155.bin
b8f82a1b5e77b1f042d7f3f3804003d26a7fa42fbc560131941f20f3cdd8abcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 2944 bytes

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