Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f8f5af83043418…

MALICIOUS

PDF

40.2 KB Created: 2020-04-03 13:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d5d01c6b6fdbedcfb63fdfaee136329f SHA-1: 3836b22fce4e6a292b1761c60481d0cf25d83a37 SHA-256: 03f8f5af83043418bcfc77614fd93ebbefa661f9e908128b430066b05bc0b925
144 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine rankings for malicious sites. The presence of a 'download button' lure further suggests an attempt to trick the user into interacting with the document. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://greensremodelingandrestoration.com/uploads/1/3/0/7/130775856/130775856.html#medal+placement+on+dress+blues+navy
    • http://lpxstudios.com/uploads/1/3/1/1/131164321/bupuxekofelevasidoba.pdf
    • http://crafteroffun.com/uploads/1/3/0/6/130605065/b84cc23b7d30.pdf
    • http://sigdt.com/uploads/1/3/0/5/130590353/98f9698f8f69eb.pdf
    • http://marcuslaster.com/uploads/1/3/0/2/130270753/wobimijiv.pdf
    • http://softasr.com/uploads/1/3/0/4/130435938/9f0429d232.pdf
    • http://frescooperatheatre.com/uploads/1/3/0/7/130776542/4196422.pdf
    • http://cateringgenova.com/uploads/1/3/0/6/130604079/1f2e7.pdf
    • http://wanigatungapictures.com/uploads/1/3/0/5/130550688/gipoxujumu_dexugemow.pdf
    • http://greenhillpm.com/uploads/1/3/0/5/130539866/6838868.pdf
    • http://smithysluresonline.net/uploads/1/3/0/3/130313786/4562522.pdf
    • http://joshuahealthcare.com/uploads/1/3/0/5/130542920/7de04ef35a24.pdf
    • http://clpgs.net/uploads/1/3/1/4/131406121/tegasivexul-sarivin.pdf
    • http://leopoldconst.com/uploads/1/3/1/4/131406867/luvitojawo-puzewakadiz.pdf
    • http://extravaganzastore.com/uploads/1/3/1/0/131070294/tapub.pdf
    • http://polaris14.com/uploads/1/3/0/7/130775248/vubanudarivibaf.pdf
    • http://oktakstas.com/uploads/1/3/0/5/130539016/5310075.pdf
    • http://sd-acessories.shop/uploads/1/3/0/4/130476083/sabidusulinow.pdf
    • http://ngbeautymakeupstore.com/uploads/1/3/0/7/130776804/d971b22bc8a.pdf
    • http://wampumstation.com/uploads/1/3/0/8/130874496/wutawaniris_vivaxurulaj.pdf
    • http://assistancedogassociation.org/uploads/1/3/0/5/130550868/5c97e0860.pdf
    • http://cameronjkennedy.com/uploads/1/3/0/4/130436288/d3b038b56.pdf
    • http://risingstarcafe.net/uploads/1/3/1/4/131453154/zirudulokekidazov.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_off00007430.bin
1cf8d39e5e2bb8554f0604960ad480a57515f4c83f252f627898bbd82af6f9ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7430 7968 bytes

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