Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba25429af91c172…

MALICIOUS

PDF

81.9 KB Created: 2021-03-11 14:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 17938b28e09051bc447dea0de3f2ff0f SHA-1: bcf66723173e5fadb0496841c3f99d71f0068b73 SHA-256: fba25429af91c172fdf4e8847e01c8c0caaad7b43876e47a4925342ad8c6c429
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, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to drive traffic to various websites. One prominent URL, 'https://ponafet.ru/wix?keyword=ios+caller+apk', indicates a potential lure related to mobile applications. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the structure and numerous external links point towards a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=ios+caller+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451363/normal_5fdeef1ab53e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481064/normal_5fec4e7e6cd8e.pdfIn PDF document text
    • https://tojaxufuvubugo.weebly.com/uploads/1/3/4/6/134641466/4415530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fca030e217b2.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/4603087.pdfIn PDF document text
    • https://guvixiwek.weebly.com/uploads/1/3/5/9/135976323/3585996.pdfIn PDF document text
    • http://visetazide.medianewsonline.com/60722054986.pdfIn PDF document text
    • https://marajudalade.weebly.com/uploads/1/3/1/4/131438096/d61ff320.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/grounded_theory_definition_glaser_and_strauss.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/25207489182.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456660/normal_60006d4e6c2e0.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/13313929719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_6018a7cba3f90.pdfIn PDF document text
    • https://fumuzuwuwuwupu.weebly.com/uploads/1/3/0/9/130969925/5123235.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_e2a96e0c5b5640c0b12bc4cd1c3cbaef.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_8615016897b740ab826b0fdf1c1967e6.pdf?index=trueIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_822d31f49a7348738290bad9c14a8d31.pdf?index=trueIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_f3361fd129914d6e9ec5c974f21a0629.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_47a85984214a456a9e41112001f531cc.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD846 6548 bytes
SHA-256: 4c1c3724a61035191ef365c0882129a992a81433b67576a214523e955f481a1d
font_01_sfnt_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 4928 bytes
SHA-256: b34a1570d0441d041353feb8d75c3d6861aa90b571d598b25eb51bf0a2c7b814
font_02_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 1688 bytes
SHA-256: efe949e4fa015a949b32bdf9d788d0424b1c4c12aae6fb55d23daf114a2369bb
font_03_sfnt_off000101cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CD 10040 bytes
SHA-256: a9ef25561fe02d0b82af041889f8e3ce7b58438052b875d6d9eb220ea09e20b7
font_04_sfnt_off0001245a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 16148 bytes
SHA-256: 20f59c87e9b9672ab98c41d2e905cf651a78fdd3ce15703607ff36fd27750faa