Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8ccc9c2ec284f5…

MALICIOUS

PDF

53.8 KB Created: 2020-03-21 19:25:29 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-07
MD5: 96dd0db032c43aad1a1cd965ba05f0eb SHA-1: 5dc8fbcec4f2d3b321ddf1ad1e54456202e357be SHA-256: 4c8ccc9c2ec284f57d7f3d292a870d3432574baa3699dd019c5894250479cce7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. The primary function appears to be acting as a link farm, potentially for SEO manipulation or to distribute further malicious content through the linked PDFs.

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://serafinaappel.com/uploads/1/3/0/2/130272332/130272332.html#hidruro+de+cobre+i+formula+quimica PDF link annotation
    • http://friendsofrenaldialysis.net/uploads/1/3/0/3/130379435/lisevoxemeguz.pdfIn PDF document text
    • http://thomastrevethan.com/uploads/1/3/1/1/131163660/mavivigelubij-voxukuf-nirozukimejur-mawiritod.pdfIn PDF document text
    • http://skynetinternational.org/uploads/1/3/0/5/130541881/6826a233292691.pdfIn PDF document text
    • http://bnstem.com/uploads/1/3/0/7/130775078/5239089.pdfIn PDF document text
    • http://publicinfo.dk/uploads/1/3/0/9/130969541/269753.pdfIn PDF document text
    • http://buoyspier37.com/uploads/1/3/0/6/130604732/4702921.pdfIn PDF document text
    • http://harvestmoonmarketllc.com/uploads/1/3/0/7/130775796/88da52d.pdfIn PDF document text
    • http://fw.jtm-associates.com/uploads/1/3/0/2/130272347/lapafajujowos_jevop_senonafavivev.pdfIn PDF document text
    • http://mrsjlittlefield.com/uploads/1/3/0/7/130738667/3062557.pdfIn PDF document text
    • http://missit.co.uk/uploads/1/3/0/4/130483163/1620864.pdfIn PDF document text
    • http://server65247.misscarols.com/uploads/1/3/0/7/130775031/2769968.pdfIn PDF document text
    • http://thehoebox.net/uploads/1/3/0/5/130551299/xarivibawerasopaluku.pdfIn PDF document text
    • http://bargainlivingeugene.com/uploads/1/3/0/6/130620524/sabiv.pdfIn PDF document text
    • http://aquaponicsoutlet.com/uploads/1/3/0/6/130621367/549086.pdfIn PDF document text
    • http://peninsulapopsconcerts.org/uploads/1/3/0/5/130543057/39732fae9.pdfIn PDF document text
    • http://www.nuggetcatcher.com/uploads/1/3/0/3/130379291/e47d88116.pdfIn PDF document text
    • http://cpanel.maplewoodcommunitymusic.org/uploads/1/3/0/7/130775108/nowud-zufoniduza-norijavutagu.pdfIn PDF document text
    • http://schraderlivestock.com/uploads/1/3/0/8/130813539/2101546.pdfIn PDF document text
    • http://ophsclassof1999.com/uploads/1/3/0/6/130605374/5636868.pdfIn PDF document text
    • http://bpgaragemaine.com/uploads/1/3/0/6/130621082/2412336.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
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8745 9280 bytes
SHA-256: 91ff3cce151e98a1dcd81dc3b5cf85b8dd3c1599dd90f1f3a46c6f744f1e4441
font_01_sfnt_off0000a8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F3 2732 bytes
SHA-256: 0ef1112e50e2a86488aadde4d8a477a3649c66578d8f2a84f2c6ad20bbddbbf8
font_02_sfnt_off0000b2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A0 16036 bytes
SHA-256: 779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63