Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b259dd8f5213db…

MALICIOUS

PDF

31.7 KB Created: 2020-04-27 01:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f719c2d925d81e06f31152fb48ae1790 SHA-1: 23a9c0046f03cc0ddaadda832b8e716c67965eb9 SHA-256: 95b259dd8f5213dbef22e0a6d61fe9b132c6d0271cf1bec399c6d90bb261d68d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the sheer volume of external links suggests a malicious intent to redirect users to potentially harmful content or to manipulate search engine results.

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 http://stubbornpositivity.com/uploads/1/3/0/3/130323322/130323322.html#jasper+report+documentation+pdf
    • http://apoorvarajesh.org/uploads/1/3/1/1/131164152/971ceea0.pdf
    • http://smartliving2.com/uploads/1/3/1/6/131637583/wixiv_zebowu_wefumewam_kuvebidof.pdf
    • http://apostillesnyc.com/uploads/1/3/0/2/130272592/pigunoti.pdf
    • http://fastpacedfoodie.com/uploads/1/3/0/6/130604685/jiwatuzuzekawusaxib.pdf
    • http://sheaultima.com/uploads/1/3/1/4/131483356/vikutarokixasiz-muvexezuvotax-manutibu-kitiborezevuvag.pdf
    • http://kwwallawalla.com/uploads/1/3/0/2/130272477/36a6ac7c95585b9.pdf
    • http://tec-is.com/uploads/1/3/0/2/130272070/sarodobivupaja.pdf
    • http://victoriousministries.net/uploads/1/3/0/5/130543543/7732546.pdf
    • http://shelbyflinnphotography.com/uploads/1/3/1/4/131483197/0507a.pdf
    • http://hostmaster.blockchain-real.at/uploads/1/3/0/5/130588258/janadasokozuxaf.pdf
    • http://travisperkinsphoto.com/uploads/1/3/1/0/131070112/mibudexuvaz.pdf
    • http://gatheredboutique.com/uploads/1/3/0/5/130552073/8327831.pdf
    • http://bournemouthmindfulness.net/uploads/1/3/0/4/130479008/mosamiga.pdf
    • http://encompasflamenco.us/uploads/1/3/0/3/130313314/xuwirob.pdf
    • http://jereobrien.com/uploads/1/3/0/6/130603690/1cde382a5c8f1b.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005452.bin
f63238f044c1e24f1c4e164b2e64205cda936456271b9c5aba17f03a7360bd69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5452 7724 bytes

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