Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a8bfb8acaa1595…

MALICIOUS

PDF

56.1 KB Created: 2020-03-07 19:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1a6227032f8f9a7883c53570ed913ca SHA-1: a6dfee6306ed9f5b2b46d89ef04f4a58c391b194 SHA-256: 13a8bfb8acaa15957ff38a4bafa87d47d9d138589b6c10e79f731b7958f602b9
136 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDFs hosted on various domains, indicating a link farm or SEO abuse tactic. One heuristic specifically identified a PDF link to an algorithmically-generated URL, suggesting automated content creation for malicious purposes. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the extensive use of external links points towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kreativekidsworld.com/uploads/1/3/0/5/130538996/130538996.html#naca+aerofoil+pdf
    • http://carolynsbishop.com/uploads/1/3/0/5/130543053/vurop.pdf
    • http://mineralintelligencecapital.com/uploads/1/3/0/6/130639785/rudaneraloxivel.pdf
    • http://junkremoveservice.com/uploads/1/3/0/2/130270777/lewos.pdf
    • http://mossvalewellbeing.com/uploads/1/3/0/6/130639835/mojigoxetin.pdf
    • http://rfizz.com/uploads/1/3/0/8/130874278/jisaleletono.pdf
    • http://alisoncarbonel.com/uploads/1/3/0/6/130621108/2b37b20737.pdf
    • http://cirilorenovations.com/uploads/1/3/0/8/130813972/rodikesovum_vewuxadum.pdf
    • http://mx.rrshakti.com/uploads/1/3/0/7/130738534/medolezepuloneb-lagezabewilifo-kepeze.pdf
    • http://cornerstonecreationslawn.com/uploads/1/3/0/4/130483215/9237287.pdf
    • http://sandiegoautodetailingservice.com/uploads/1/3/0/7/130740342/munobapamepaverati.pdf
    • http://chartwell-consultants.co.uk/uploads/1/3/1/0/131070381/sawoko.pdf
    • http://musicwithjojo.com/uploads/1/3/0/7/130739140/sezukub.pdf
    • http://www.bluehorizonspaddlesports.com/uploads/1/3/0/8/130814933/ruwep-kusorezagewaked.pdf
    • http://bobbyselectrical.net/uploads/1/3/0/5/130539287/318106.pdf
    • http://developmentechnwkllc.com/uploads/1/3/0/7/130776381/6f97646b5.pdf
    • http://edwarddeleski.com/uploads/1/3/0/6/130620730/8552430.pdf
    • http://recreationlandcanadaflorida.com/uploads/1/3/0/7/130739732/gidug.pdf
    • http://artisticcreationsbycarma.com/uploads/1/3/0/6/130604939/jujezebifuxelu.pdf
    • http://crompers.com/uploads/1/3/0/8/130814192/fomekevuwizizavegalo.pdf
    • http://your1life.com/uploads/1/3/0/5/130543813/junevurakadeku.pdf
    • http://standingupforwomeninireland.com/uploads/1/3/0/9/130969893/7145769.pdf
    • http://laceyandleatherexoticattirellc.com/uploads/1/3/0/4/130435570/dodurifiboratov-godetikodiguta-binisuzubo-lonilover.pdf
    • http://canyoupark.com/uploads/1/3/0/5/130544790/lolanidor-memifu.pdf
    • http://parcelshipping.international/uploads/1/3/0/7/130739944/pirapirike.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_off00009151.bin
fee6f483d16ae4b9eff8ffbc531cc4653288cfbb23090ea8f8943543a4f5a079
pdf-font-stream PDF embedded font (sfnt) at offset 0x9151 8632 bytes
font_01_sfnt_off0000b276.bin
23ed613d66e62d7492f083dd3d1aa2d2971aeb1fa9ed000d0284fe7502844c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB276 3064 bytes
font_02_sfnt_off0000bd43.bin
98958365168029d4f54c753cd9186d92cfe6c3bbbc0f7ce7585e6a5e6ab2bca4
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD43 16040 bytes