Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea2f028cef820ad…

MALICIOUS

PDF

74.0 KB Created: 2021-03-29 10:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b2ac29c15ed90313e497eded4ec6178 SHA-1: dc2e9ff2fda59c9b715f0b2bf0959665a962b277 SHA-256: 6ea2f028cef820ade2011829fc9d43adf97b60ca000086d888a277d0e154674c
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files. The primary URL, 'https://golowaki.ru/award?keyword=broadcast+package+pdf', suggests a lure related to package delivery or broadcast information. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. While no scripts were explicitly extracted, the structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://golowaki.ru/award?keyword=broadcast+package+pdf
    • https://vavujajakakef.weebly.com/uploads/1/3/0/7/130740385/genemagufip_surojisumumusov_zozom_womila.pdf
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/funowe.pdf
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/9286372.pdf
    • https://cdn.sqhk.co/vinikawikuve/ShfahfS/mathletics_student_app_for_iphone.pdf
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/regupirisag.pdf
    • https://budogifu.weebly.com/uploads/1/3/0/8/130874026/4fdcf9.pdf
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/c5389c2cadc.pdf
    • http://igbusinessabouthelp.com/active_and_passive_voice_testshz7b.pdf
    • https://cdn.sqhk.co/girewobo/iggfja4/42557574947.pdf
    • http://hotsales-com.xyz/dufowama2nvnf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/saxefi/false_imprisonment_meaning_yahoo_answers.pdf
    • http://ximajaz.epizy.com/adobe_photoshop_7._0_filter_software_free.pdf
    • https://s3.amazonaws.com/rabewiruzitewa/danenijepomopuliru.pdf
    • http://relulaxalituguw.rf.gd/bass_guitar_for_dummies_free.pdf
    • https://s3.amazonaws.com/desekusoxi/audience_clapping_sound_effect.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a1.bin
c818d15753a6c27afcc87f0e94c41191198edf1c66ec111339753c2249972d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 5404 bytes
font_01_sfnt_off0000f719.bin
42750d345b72337b3cca2ea1db74982e4bcaf8f7370b745fb639b6cc6ed96e85
pdf-font-stream PDF embedded font (sfnt) at offset 0xF719 10620 bytes