Malicious PDF — malware analysis report

Static analysis result for SHA-256 4096e760abae7584…

MALICIOUS

PDF

107.4 KB Created: 2020-05-18 00:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 80a25935577dfb9636d71a9eddcbc369 SHA-1: 9721fff54914a77d62d11d640300b4e3bd4bab8c SHA-256: 4096e760abae758433ef3c874bb640ecfa3aab1b4855eaec08ed360a33744186
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The document body itself is heavily obfuscated and contains some of the URLs, but does not provide clear instructions. No scripts were extracted from this sample. The primary attack pattern appears to be the distribution of numerous external links, likely to manipulate search engine results or to serve as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://wpcg.org/uploads/1/3/0/6/130604388/130604388.html#cpc+1017+datasheet PDF link annotation
    • http://godseffect.com/uploads/1/3/0/4/130436074/acf3be4ad58.pdfIn PDF document text
    • http://examplesite.biz/uploads/1/3/0/3/130313000/1cd185e867.pdfIn PDF document text
    • http://entreprenorth.org/uploads/1/3/1/4/131437394/9fa17.pdfIn PDF document text
    • http://sunnybottom.com/uploads/1/3/0/6/130639266/f77bf794b2.pdfIn PDF document text
    • http://icrj-aejmc.com/uploads/1/3/0/5/130540554/38c239299a3bf.pdfIn PDF document text
    • http://etherealimageadvent.org/uploads/1/3/0/7/130776814/9837603.pdfIn PDF document text
    • http://homemortgage.services/uploads/1/3/1/3/131379420/mavidujekejufus.pdfIn PDF document text
    • http://emilygerngross.com/uploads/1/3/0/4/130483290/fexatumofan.pdfIn PDF document text
    • http://plusquevainqueur.net/uploads/1/3/1/3/131381712/vitemisa.pdfIn PDF document text
    • http://provide-coffee.com/uploads/1/3/0/2/130270918/8094357.pdfIn PDF document text
    • http://lowesttruckinsurance.com/uploads/1/3/1/1/131164202/bomibidif_mapub_veraberog_jomiwa.pdfIn PDF document text
    • http://vivianscrown.com/uploads/1/3/0/8/130874563/sijolesab_xorolavatugadig.pdfIn PDF document text
    • http://homespryte.com/uploads/1/3/0/6/130621330/mazeweve_fitoberoxu.pdfIn PDF document text
    • http://kirkjayfanclub.com/uploads/1/3/0/6/130620846/553064.pdfIn PDF document text
    • http://vcvids.com/uploads/1/3/0/4/130436242/maduxukalagikadi.pdfIn PDF document text
    • http://notyourshop.com/uploads/1/3/1/8/131857334/886308f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000063a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x63A8 84816 bytes
SHA-256: 9a0c3713212149fbffef1b43660e7e1f9e6fd3bed5f66bfd4f6ff627156cbdeb
font_01_sfnt_off00016093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16093 11764 bytes
SHA-256: d95a1394d50551dfa44d9d8e2c5d5d41c646b6f946f4b5f3f87ff6896f17a76f
font_02_sfnt_off0001890b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1890B 16208 bytes
SHA-256: 386b790d1d9ce13b171fa75da4b230246976ad5417fcb3c45d956e9311ee73f2

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