Malicious PDF — malware analysis report

Static analysis result for SHA-256 6818ae91fe6fdafb…

MALICIOUS

PDF

68.9 KB Created: 2020-04-11 19:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2fe130c8fc41f4b5e1aa686885ddd888 SHA-1: 3fee8162a081ffb0aaed1c90f3b7903cc81f6a06 SHA-256: 6818ae91fe6fdafbd1dadb750baa703806209bbe70881185e02b3c8a504af320
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or content distribution network. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to distributing malware or engaging in SEO manipulation. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious dropper or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • ClamAV: Pdf.Dropper.Agent-9167591-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9167591-0
  • 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://deanadurisic.com/uploads/1/3/0/7/130776489/130776489.html#tai+chi+48+form
    • http://livefreemedia.net/uploads/1/3/1/0/131070124/7396730.pdf
    • http://essentialaffair.com/uploads/1/3/0/7/130738541/62b969c509.pdf
    • http://envirotw.com/uploads/1/3/0/7/130775195/2202235.pdf
    • http://canberrabreathwork.com/uploads/1/3/0/4/130478067/a9ee912.pdf
    • http://jenithanmoore.com/uploads/1/3/0/5/130588390/derejofurux-tapav-ruwesurekabet-zojopitij.pdf
    • http://feedmeadventures.com/uploads/1/3/0/8/130814382/266156.pdf
    • http://myorganicexpression.com/uploads/1/3/1/4/131438784/8248495.pdf
    • http://kelsygoodwin.com/uploads/1/3/0/5/130589393/purezonunesopopazu.pdf
    • http://newtampatraillife.com/uploads/1/3/0/5/130540583/pagipizu.pdf
    • http://zendafarm.org/uploads/1/3/0/7/130738962/wivodobiw.pdf
    • http://greenaccountingandtax.com/uploads/1/3/0/7/130738870/d172741.pdf
    • http://thelifestylelottery.com/uploads/1/3/1/4/131438825/3837720.pdf
    • http://labtcenter.com/uploads/1/3/1/1/131164210/71328c5193081.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006973.bin
e36856203a1d6fffa75c7d7c8e7537ff06546169c66af9afd3556155d3788332
pdf-font-stream PDF embedded font (sfnt) at offset 0x6973 8048 bytes
font_01_sfnt_off00008879.bin
00c27ca966c249c7d29aa342dc992d0401cc32ee6412d0ba7a97477bd787f9f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8879 35352 bytes
font_02_sfnt_off0000f223.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 16036 bytes