Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b57ecb957d9cc7c…

MALICIOUS

PDF

36.4 KB Created: 2020-05-16 12:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6f94695b4d959a6b089b8ee67803dbec SHA-1: 87e85e084138d85cca9571ec55af58cb03d7d64b SHA-256: 0b57ecb957d9cc7c2a357fa7a829b8bc6925d71c81998af8a58954cf53904f10
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or a method to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body itself is largely unreadable, making the link farm the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ajbsecurestorage.net/uploads/1/3/0/2/130291640/130291640.html#bastion+primary+school+application+form+2020
    • http://thicares.org/uploads/1/3/0/7/130775016/e29dfbccfcc.pdf
    • http://eringjohnson.com/uploads/1/3/0/8/130813079/mujuzapama.pdf
    • http://komisniprodej.cz/uploads/1/3/1/3/131384481/wesenoga.pdf
    • http://easymarketingmethod.com/uploads/1/3/0/7/130739686/6964184.pdf
    • http://salesnleasing.space/uploads/1/3/1/3/131398094/6335123.pdf
    • http://myhomecleaningservices.com/uploads/1/3/0/7/130775358/ririsawebobu_vukizububatazep.pdf
    • http://themontsd.com/uploads/1/3/1/3/131380901/fcb7ddb8b8cf3.pdf
    • http://latherit.net/uploads/1/3/1/6/131637021/zudiromanitej_nopasovuma_rovumu_fojulero.pdf
    • http://sweetwatermariposa.com/uploads/1/3/0/6/130605501/pibanarale.pdf
    • http://stiknstop.com/uploads/1/3/0/7/130738963/wonij-dofexol.pdf
    • http://petedevriese.com/uploads/1/3/0/3/130324241/zavogasesibazab.pdf
    • http://jana-cooper-jewelry.com/uploads/1/3/0/6/130621969/wewijidokevoj-larikelodif.pdf
    • http://joannhughes.com/uploads/1/3/0/2/130271185/xinekaxewibexikoxif.pdf
    • http://hogbosscatering.com/uploads/1/3/0/6/130620555/52a027537.pdf
    • http://bhmoffroadtestfacility.com/uploads/1/3/0/7/130776168/6504927.pdf
    • http://worldsintowords.com/uploads/1/3/0/5/130588572/kotilogibimepikikupa.pdf
    • http://cr-routines.com/uploads/1/3/0/6/130604049/d37cc90d62.pdf
    • http://13weekmap.com/uploads/1/3/0/8/130874358/6427001.pdf
    • http://resiliencesoaps.net/uploads/1/3/0/5/130545627/43670a.pdf
    • http://thetablebroadstairs.com/uploads/1/3/0/7/130775840/lusud.pdf
    • http://rachiebuckleybeauty.com/uploads/1/3/0/4/130489230/pagiguvebazobe.pdf
    • http://barrons100.com/uploads/1/3/1/8/131857314/b2e2c92c2c47c.pdf
    • http://carverarms.com/uploads/1/3/0/6/130621836/7447051.pdf
    • http://susanozawaperez.com/uploads/1/3/0/5/130539928/mujeradevizuguf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006260.bin
2c645a8703a417a4bc6003f21a6e14e9d429549d6ecee3bb266f2ef5214992a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6260 10260 bytes

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