Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c99d39f54d4735…

MALICIOUS

PDF

52.6 KB Created: 2020-03-24 17:38:28 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 268a6cf1237081ba516f3a90510ac2e9 SHA-1: 6cd81032a25de59df46c942677c2b466f0f4420b SHA-256: 15c99d39f54d4735e78cddcbad2db9e1f6ba059b346454debe1f9009bce5bbb6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links to various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially corrupted, contains a URL that is also present in the list of external links, suggesting a coordinated effort to direct users to potentially malicious content. No scripts were extracted from this sample.

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://gracewoodinbloom.com/uploads/1/3/0/2/130287500/130287500.html#pendulo+simple+ejercicios
    • http://mta-sts.apollopestcontrol.name.my/uploads/1/3/0/4/130489437/b74148d195.pdf
    • http://solomanproject.com/uploads/1/3/0/4/130483510/59d5b0e.pdf
    • http://lilyandcophoto.com/uploads/1/3/0/6/130620690/6301057.pdf
    • http://blockminelaos.com/uploads/1/3/0/5/130590525/zexemanirafibo.pdf
    • http://qutasa.com/uploads/1/3/0/4/130488934/nizemutaxif.pdf
    • http://www.yabilamx.com/uploads/1/3/0/6/130604620/6689602.pdf
    • http://bradleygorman.com/uploads/1/3/0/6/130622106/6599986.pdf
    • http://ticketmenow.us/uploads/1/3/0/5/130551746/6c06533b00c58a.pdf
    • http://7zauc.bpmtc.com/uploads/1/3/0/5/130545895/zixokore.pdf
    • http://nevrapoint.com/uploads/1/3/0/4/130476395/6548713.pdf
    • http://640stonehouseln.com/uploads/1/3/0/7/130775448/zetupu.pdf
    • http://camplakesranch.com/uploads/1/3/0/4/130488580/3054053.pdf
    • http://cashmorris.org/uploads/1/3/0/6/130621462/a6603.pdf
    • http://tntacademysp.com/uploads/1/3/0/6/130620346/3969a.pdf
    • http://www.financialliteracy101.net/uploads/1/3/0/6/130621946/vidimugan-jokefumelivage-koxif.pdf
    • http://chironics.com/uploads/1/3/0/2/130270951/924625.pdf
    • http://cotoart.com/uploads/1/3/0/3/130379067/9263201.pdf
    • http://www.bellmansionbedandbreakfast.com/uploads/1/3/0/6/130621301/754785fa296bee.pdf
    • http://akankshanegi.net/uploads/1/3/0/7/130776656/3096441.pdf
    • http://hoysi.com/uploads/1/3/0/6/130604732/vavonixeluwax-fekivubaso-wuxudepedogu.pdf
    • http://mypersonalgifter.com/uploads/1/3/0/5/130550998/816da11.pdf
    • http://fiddespayne.com/uploads/1/3/0/3/130379488/zudakigaz_nefifiwejo_nifovirixutuja.pdf
    • http://centralcarolinasazaleasociety.org/uploads/1/3/0/5/130550938/kujemev-fakewonuzipup-rofufowaxukibe-sekemom.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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • 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_off00007da2.bin
78c7faba5e5ce9cb7594814d379d4162a0c01c473be4a7254f0b0926a52eaddf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA2 10056 bytes
font_01_sfnt_off0000a19b.bin
8dfd1c7c12f230aa7b5f63f59905e013decf584281a3cef3cbe02382e79bcd94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA19B 3168 bytes
font_02_sfnt_off0000acc2.bin
4be9c16324972a0f28c45cf3f004490c479198a428d5798a8b51eff4d332b891		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACC2 16172 bytes

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