Malicious PDF — malware analysis report

Static analysis result for SHA-256 d165a80f058ed9b0…

MALICIOUS

PDF

53.0 KB Created: 2020-03-13 04:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 300a1f7db8ffcd66642e9382c0cf781b SHA-1: cfe65ade2d267bdca968d54edd29820e58686a77 SHA-256: d165a80f058ed9b0ca75e7f827e7f6fcaeac2794dbf62b56168c130e84c128ef
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The embedded document body text is largely unreadable due to encoding issues but contains a reference to 'deep breathing exercises to help sleep', which may be a lure.

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://theovercomersblueprint.com/uploads/1/3/0/2/130270918/130270918.html#deep+breathing+exercises+to+help+sleep
    • http://beautifulgranitellc.com/uploads/1/3/0/6/130605426/bebuwitejeraloja.pdf
    • http://clearbrightfuture.net/uploads/1/3/0/6/130604014/netapukupovem_fifowat.pdf
    • http://morrisplantnursery.com/uploads/1/3/0/8/130874457/7624915.pdf
    • http://absolutenorthwest.com/uploads/1/3/0/4/130489082/gufigiwuf.pdf
    • http://mindforyou.org/uploads/1/3/0/6/130604342/70294.pdf
    • http://alexandrethiery.com/uploads/1/3/0/5/130590395/b1356c58098.pdf
    • http://stalvanjaarsveld.nl/uploads/1/3/0/6/130640049/96e5007b201ffc.pdf
    • http://qurxintagurayaha.com/uploads/1/3/0/8/130873781/dinasemupuw-mejogiwekogafe.pdf
    • http://martincapdevila.com/uploads/1/3/0/4/130476481/69488b888f49.pdf
    • http://adrisbeautystudio.com/uploads/1/3/0/2/130272414/350583.pdf
    • http://claupandolfi.com/uploads/1/3/0/2/130272945/nudulom.pdf
    • http://phapapp.net/uploads/1/3/0/6/130621044/nodefevomoxo.pdf
    • http://evan.co/uploads/1/3/0/6/130604862/faxonubarudikawal.pdf
    • http://521.bpmtc.com/uploads/1/3/0/7/130739719/lofuvivovowu-jisilefeposix-tanabasoxop.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009122.bin
169877e94f229d3051065d69aef129cfcd5e11903b2a6aff5dd66753432b9a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9122 8068 bytes
font_01_sfnt_off0000b070.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB070 16036 bytes

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