Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6c21cb6584b588…

MALICIOUS

PDF

42.7 KB Created: 2020-05-22 14:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8948991212f4460ad8b65aed2a0cac40 SHA-1: 51a47263031c0fb3f002d2139c9af6201aa30c52 SHA-256: 5e6c21cb6584b5883182ca48517582df077857bb8408e25e77dc55c4994b94bf
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are dynamically generated and point to other PDF files, suggesting a link farm or redirection scheme. The document body, though partially corrupted, contains text related to magazine downloads and includes several URLs that are likely used to redirect the user to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm.

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://hvo48.slpny.com/uploads/1/3/0/7/130775088/130775088.html#overdrive+india+magazine+pdf+free+do
    • http://spalderick.com/uploads/1/3/1/3/131380305/9bb6835116a.pdf
    • http://idutur.info/uploads/1/3/0/5/130590111/vodeboliru.pdf
    • http://newfiebullet.net/uploads/1/3/1/4/131438050/2943362.pdf
    • http://jllcapitalmarkets101northwacker.com/uploads/1/3/1/4/131437306/kibupevelorimegafe.pdf
    • http://crookedacrefarmsupplies.com/uploads/1/3/2/3/132303338/vobowaluwazuwuze.pdf
    • http://poolbocks.com/uploads/1/3/1/4/131406146/vugufezemugidis-woledewujusu-rekawakuzovasud-luketumo.pdf
    • http://completebydesigncbd.net/uploads/1/3/0/2/130271096/03adc1d682be8.pdf
    • http://orsidpharma.com/uploads/1/3/0/6/130605396/fizikesawu-bejipi-mamobimarila-xewaneliperexa.pdf
    • http://lemkeequipmentco.com/uploads/1/3/0/6/130620510/f622ed183a49cb.pdf
    • http://mollypowers.com/uploads/1/3/1/0/131069766/namelujamo_xuwuvusezib_dabaketudebom_xezit.pdf
    • http://stephanihyatt.com/uploads/1/3/0/9/130969599/9376810.pdf
    • http://gloryofmaude.com/uploads/1/3/0/3/130379492/5ee11ff6fc24c7.pdf
    • http://knowltonplacehomes.com/uploads/1/3/0/7/130740477/dosoxedolojuboluv.pdf
    • http://swiftlandscapes.net/uploads/1/3/0/4/130435998/2245267.pdf
    • http://ucdemr.com/uploads/1/3/1/0/131070187/4495224.pdf
    • http://shinkojiki.org/uploads/1/3/0/8/130873978/tuwuremugedi.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_off00007ac0.bin
4d282dd607a5d704cfea6fc9f09ca86cd4c113a48ad8eb5539ef3a1c7b138c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC0 10736 bytes