Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd13ebcdba8f0ed3…

MALICIOUS

PDF

95.6 KB Created: 2021-03-16 17:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d6e5a25c6478c528010ec442ab683943 SHA-1: da0cd39a36e0b2da3f8af274a0a8894a9b180424 SHA-256: cd13ebcdba8f0ed3634496de1dc752369fb99cf2ea86bfda0287601cb41f4008
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, with one prominent URL pointing to 'maypoin.ru/award'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/award?keyword=contexto+social+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490116/normal_5feaf97c9b3a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_5fdbae571e61f.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/51860883326.pdfIn PDF document text
    • http://vawadofofasip.getenjoyment.net/rd_burman_songs_list.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/xudebijogi.pdfIn PDF document text
    • http://kixiwogazu.sportsontheweb.net/arthur_clarke_the_sentinel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487194/normal_5ff0438581ee0.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/decameron_giovanni_boccaccio_espaol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_603c4c5e2dfbb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422137/normal_5feafcdc720f2.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/42634042896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_75578d358e83494aa8bcb2de6a849aaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/60236333057.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_1c8f88e5153e4494b6e16301699b21f0.pdf?index=trueIn PDF document text
    • https://f1e11ea9-a931-46ad-af30-391325c877dd.filesusr.com/ugd/423518_ab194accedd2472bb6759b665c818446.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/wefubovope.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/75087918061.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_6fb7723ffe0845189fc8459920dd2f2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/14916259099.pdfIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 6568 bytes
SHA-256: 611f3db65d644b1c54ca9459fd1b922419f4f90529f892feeb7d4571f542e8e8
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 4932 bytes
SHA-256: 5167691288cd1e7d17740e342e3fa3f0ca7f44fbd3de47555450079632190db2
font_02_sfnt_off00011abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 2976 bytes
SHA-256: 9326c033f07675e87cfca3e4318941a725c7ee388d57efb28cb03744d6481d2e
font_03_sfnt_off00012775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 11636 bytes
SHA-256: 0d67e5d359dd46f43c1375f229eda0e6b458128ee206502f681c31a321441bb1
font_04_sfnt_off00014d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9B 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1
font_05_sfnt_off00016203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16203 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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