Malicious PDF — malware analysis report

Static analysis result for SHA-256 853155438beb713f…

MALICIOUS

PDF

80.5 KB Created: 2021-03-21 07:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: db7bf21ce75104b423e50baec8a0a808 SHA-1: 586c31b654f89f36ba8fe1f843689a9eebe0ddd3 SHA-256: 853155438beb713f4b1b50e1637240b327550e685ec0c01d2e7435967340aec4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicative of a link farm or a phishing attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of many external URLs and the document's structure point towards a malicious PDF designed to trick users into downloading further payloads or visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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/award?keyword=curriculum+vitae+format+pdf+download PDF link annotation
    • http://pikejofopon.mypressonline.com/how_much_turkish_steel_does_the_us_import.pdfIn PDF document text
    • http://xidufefonudug.sportsontheweb.net/41709780771.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/what_comes_after_360_no_scope.pdfIn PDF document text
    • http://nibajafij.medianewsonline.com/dyson_big_ball_multi-floor_canister_vacuum_filter.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/catalogo_ngk_mexico.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://9a86171b-24d8-4f43-8717-687e75280c8f.filesusr.com/ugd/6234e8_d54d7800ef714b228cffc1e28b77f7a5.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_ae5cbe165903440685624d010a712a7b.pdf?index=trueIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_00cc86ac8c64495485a60813f8501fa7.pdf?index=trueIn PDF document text
    • https://16fd3b15-5541-4454-9538-28daacbf497e.filesusr.com/ugd/e32576_3d6d7bc57caf4b779685483ccc9d61cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julaxel/adobe_flash_player_11._2_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/uc_browser_apk_for_android_4._0.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_71f1fb4123534facade49204f95f1477.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_1aff9484d08f4afeb1f24dd8474dbdca.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_13ee91cdda3548a19ee239e6b0be1a39.pdf?index=trueIn PDF document text
    • https://0115c081-d8bc-4983-a705-81db93bf1442.filesusr.com/ugd/990402_2557041261474e048ccbcd1b402d28de.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_ea367e48b1394f6f98b4f5234036a6fb.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_36665d295dde47f289bbbcd65d3e983c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nisoxow/kenmore_quiet_comfort_12_humidifier_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/wilubisafil.pdfIn PDF document text
    • https://0a6609f8-ec05-4c06-9017-86806a0ecaf5.filesusr.com/ugd/a9248e_7c5aa3fa871c43d689666dbe6ceb27f4.pdf?index=trueIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_6c1dc3d7eacd41398591c8da5849af61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/donake/ashoka_full_movie_hd_mp4.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 5180 bytes
SHA-256: abb28331e27f7771c9f8b6349a7b8cb19ac76253f65245f865e5f76593365ca3
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10744 bytes
SHA-256: 5cb8bf674d1b4b0c76511e31859e272226938c6b685ffa011da18b43d2133447
font_02_sfnt_off00012611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12611 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34