Malicious PDF — malware analysis report

Static analysis result for SHA-256 0316a49fb7247e83…

MALICIOUS

PDF

44.5 KB Created: 2020-04-02 17:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 847392683277c8adb982cbd12f110fd4 SHA-1: 34a317da1792ee53dd8a74ab5add5e019207a861 SHA-256: 0316a49fb7247e8311c814c2731b341c9ca8e981294a67c5295fd7bf38a32044
136 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 are algorithmically generated and point to other PDF files. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://chemwayproductscorp.net/uploads/1/3/0/3/130313188/130313188.html#dictados+2+primaria+pdf
    • http://twtechnologyservices.com/uploads/1/3/0/4/130483757/7702b3de0afe.pdf
    • http://lknsuppliesgifts.com/uploads/1/3/0/7/130739072/vawigon.pdf
    • http://dollardazzler101.com/uploads/1/3/0/5/130544386/nekinura_jadawawexezo.pdf
    • http://pabucksinittowinit.com/uploads/1/3/1/4/131452902/duwifidewuxef.pdf
    • http://pacificrimasianfusion.com/uploads/1/3/0/7/130738950/b45ffd86b.pdf
    • http://yukoncircleofcare.com/uploads/1/3/0/2/130272102/0a4afe1dc4a.pdf
    • http://developelite.com/uploads/1/3/1/3/131379743/1105325.pdf
    • http://willneill.com/uploads/1/3/0/6/130639453/785986.pdf
    • http://glossbod.com/uploads/1/3/0/6/130620472/ab17299580cd5.pdf
    • http://bestchoicetaxandfinance.com/uploads/1/3/0/6/130620503/efc4de919883fdb.pdf
    • http://photosinthesi.gr/uploads/1/3/0/5/130589035/53d4a.pdf
    • http://graevesautoandtire.com/uploads/1/3/1/4/131406604/fc1cb756.pdf
    • http://mta-sts.tummyandtot.com/uploads/1/3/0/5/130545173/7909682.pdf
    • http://lesecorchesvifs.com/uploads/1/3/0/9/130969384/zunonilosus.pdf
    • http://lukebaptism.info/uploads/1/3/0/3/130313156/gukefapi.pdf
    • http://dmginteriordesign.com/uploads/1/3/0/4/130435514/gaperewakeke-xepuji-fowolavot.pdf
    • http://autodiscover.friends-school.org/uploads/1/3/1/3/131382032/taresalalomekab-vijetunipulitef-dujimomufexu.pdf
    • http://cookiedelectables.com/uploads/1/3/0/7/130740089/4439b.pdf
    • http://juicerify.net/uploads/1/3/0/4/130479082/63ba98072bffe.pdf
    • http://angelthomasinvestmentsllc.com/uploads/1/3/0/5/130550770/wogolinen_zefezaru_ruzinas.pdf
    • http://whitemountainremodel.com/uploads/1/3/0/7/130775655/3509529.pdf
    • http://faithanddemocracy.org/uploads/1/3/0/7/130775737/ea6cf451a.pdf
    • http://completecarechiropractictables.com/uploads/1/3/0/2/130289746/wamesik.pdf
    • http://onebirdgames.com/uploads/1/3/0/6/130605173/xebubakig-disijul-wafipipunewu.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_off00008300.bin
5952a15608e765b72d7e990bfeb372430e0134d49c2ea840675a559597f6e311		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8300 8756 bytes

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