Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6334a43e0807b34…

MALICIOUS

PDF

49.9 KB Created: 2020-06-26 14:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 73e3b43e39edd9e76738df7b8c36585b SHA-1: 31403f4a509b8f176a03b85c53855ac45db4d69e SHA-256: f6334a43e0807b34d2cde5e2c36a1eb405201b3f2a27faeba17dae9d4c26eba3
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to similarly structured URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a malicious intent to drive traffic or host malicious content. The document body, though partially corrupted, contains references to 'Microsoft access database development with vba pdf' and the wkhtmltopdf tool, which could be a lure to disguise the malicious nature of the links.

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://files.avvstaffarea.com/uploads/1/3/0/5/130550929/130550929.html#microsoft+access+database+development+with+vba+pdf PDF link annotation
    • http://headerimagez.net/uploads/1/3/0/3/130379398/xekeforetilavomazo.pdfIn PDF document text
    • http://artspark.com/uploads/1/3/1/0/131070407/bibonajoge.pdfIn PDF document text
    • http://pauletterose.com/uploads/1/3/1/4/131409309/e3442fd86b9e8.pdfIn PDF document text
    • http://goforlaunch.net/uploads/1/3/0/4/130489265/139300.pdfIn PDF document text
    • http://webdisk.freshbakedphoto.com/uploads/1/3/0/8/130874233/momifosobanub.pdfIn PDF document text
    • http://hostmaster.happythoughtsoraclecardreadings.com/uploads/1/3/1/0/131070331/rokogumuw.pdfIn PDF document text
    • http://utah-midwives.org/uploads/1/3/1/6/131636665/bezapogasegaz.pdfIn PDF document text
    • http://prettyinbasic.com/uploads/1/3/0/4/130435680/tadegebojepuvusevin.pdfIn PDF document text
    • http://buttaflygroup.com/uploads/1/3/1/4/131453250/5371941.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://vajoguwufisu.files.wordpress.com/2020/06/tetidunafekikewitod.pdfIn PDF document text
    • https://pomigizob.files.wordpress.com/2020/06/garalovo.pdfIn PDF document text
    • https://nirakopifaz.files.wordpress.com/2020/06/22190845951.pdfIn PDF document text
    • https://sivavolujevu.files.wordpress.com/2020/06/zedutikova.pdfIn PDF document text
    • https://figanupa.files.wordpress.com/2020/06/131048974.pdfIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8473 5480 bytes
SHA-256: 1791fe8f837fec7f7b3a6568a8533f13ca25f319034e8b94b04478f08ef61ce0
font_01_sfnt_off000096eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96EB 10488 bytes
SHA-256: 98dae0a493d90959f429c649f8e7da715642227fcbf8ff16318cd749dc0334b3

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