Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cdc37d8cd558f1…

MALICIOUS

PDF

88.7 KB Created: 2021-03-12 06:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f2a569d3042768f88e215cbe21e1b2e8 SHA-1: 5f2d7d4761370dcb6f42e286f373f8a68228b58e SHA-256: 34cdc37d8cd558f1fdd0cf9c57ae045222f5e7e7dd50b9d97fe8e72129c6d353
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to its creation, and the presence of embedded URLs points towards an attempt to redirect the user to malicious sites.

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=mechanical+engineering+interview+questions+and+answers+pdf PDF link annotation
    • https://cdn.sqhk.co/xegunorasu/xgjhcF4/59045266347.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/fjfoidl/12707496847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477916/normal_602e0200b508c.pdfIn PDF document text
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/4649411.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381095/normal_5ffa50c79a9c4.pdfIn PDF document text
    • https://kivepuwepadile.weebly.com/uploads/1/3/4/3/134392404/mirusilivivas.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/s4ifCgc/free_online_radio_stations_80_s_r_b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_601aa3dca4d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381740/normal_602c925eb3c66.pdfIn PDF document text
    • https://cdn.sqhk.co/fusuwudofal/jiijjit/the_great_courses_piano_reviews.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_60012c5007ce7.pdfIn PDF document text
    • https://gegadibiliwo.weebly.com/uploads/1/3/1/8/131871883/rinuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413231/normal_60216d9bd232d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://batogegimuwew.rf.gd/74538737658.pdfIn PDF document text
    • http://moduvovujirupe.rf.gd/cambiar_de_a_word_nitro.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_3217610b30bf4d199a42a5a0c3dceacd.pdf?index=trueIn PDF document text
    • http://sukujarodapix.rf.gd/kajegani.pdfIn PDF document text
    • https://770cee9b-59ea-4c2b-ae8d-aad83b0abb79.filesusr.com/ugd/8b25c7_c5d49387d92e44479188bb36b35a7dc6.pdf?index=trueIn PDF document text
    • http://tasaroje.epizy.com/psychology_thesis_topics.pdfIn PDF document text
    • http://feneluveje.epizy.com/nanunobogixazerepemafol.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 6588 bytes
SHA-256: 746cda19d0a45b0d6108c63ff8192b2f88c2fff5e5937e692a7cb04b31166607
font_01_sfnt_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 5700 bytes
SHA-256: c65136bf855bd22f94b497280bdc5e610927338ea088a3de2cde5583aed9867c
font_02_sfnt_off00010c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C81 2924 bytes
SHA-256: 1b8130c7c2645fee2f6e435ed3847fc4ea875e4aedc1d0e99b8dae817e7c378d
font_03_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 10712 bytes
SHA-256: 00a904da545fcf7641c4920efb8cf38be465d20642d3f2b5410bc1c0727c8eab
font_04_sfnt_off00013d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D64 16416 bytes
SHA-256: 28e5bac4618028508f257ff34b87ce7ec1455798569232c0671c4b830f2e11de