Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a03b243f069553…

MALICIOUS

PDF

80.4 KB Created: 2021-06-13 20:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb6ac587571064b32a1ae51d3d86ab27 SHA-1: 697d2a1857bf379cf29fdbe7d302ffba53898cda SHA-256: e4a03b243f0695536a54a9fff18fbe5ff8bd8befda0e6c8aa716bb345cc8b436
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the extensive use of external links points to an attempt to redirect the user to a malicious site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/pbw?utm_term=digital+fundamentals+9th+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4454672/normal_60185f1ac27ba.pdf
    • https://cdn-cms.f-static.net/uploads/4480590/normal_60665b7f727bd.pdf
    • https://bofufawikifof.weebly.com/uploads/1/3/4/2/134235483/vidakidajesolatok.pdf
    • https://cdn-cms.f-static.net/uploads/4501479/normal_601a406e09f78.pdf
    • https://pexififowuru.weebly.com/uploads/1/3/4/7/134714045/kikekab.pdf
    • https://static.s123-cdn-static.com/uploads/4502268/normal_5fe178aaa0def.pdf
    • https://zugogulubituwo.weebly.com/uploads/1/3/4/2/134266111/kivetijugixiso.pdf
    • https://seperabe.weebly.com/uploads/1/3/4/7/134714478/ridaba.pdf
    • https://fojevatiseme.weebly.com/uploads/1/3/4/4/134400043/6522817.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jesababa.pbworks.com/w/file/fetch/144613683/sozujekujuk.pdf
    • http://ralogotuxa.pbworks.com/f/nidugi.pdf
    • https://uploads.strikinglycdn.com/files/569a63d5-1fd6-4d43-8bb4-1f47dd436a2a/23664109401.pdf
    • http://vowetegaperi.pbworks.com/w/file/fetch/144893547/the_kissing_booth_2_putlockers.pdf
    • https://uploads.strikinglycdn.com/files/b63ac740-3703-4f9e-81d1-e265317f2e15/zidobovakoli.pdf
    • https://uploads.strikinglycdn.com/files/31c5912c-0375-4394-8704-dbc049bab574/what_makes_a_real_man_quotes.pdf
    • https://uploads.strikinglycdn.com/files/b28045fa-744a-41d8-a44c-4341e1469150/musical_notes_images.pdf
    • http://wudiwiligis.pbworks.com/f/where_do_you_inject_igf_1_lr3.pdf
    • http://duziruromeja.pbworks.com/w/file/fetch/144786459/sexomuvaravazov.pdf
    • http://juvupumanut.pbworks.com/w/file/fetch/144527334/power_rangers_2017_full_movie_in_tamil_free_download.pdf
    • https://uploads.strikinglycdn.com/files/dacb436f-86e7-4019-9b1e-e04c978efc09/cooler_master_storm_trooper_front_panel_connectors.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efad.bin
346a54dade523994984aa638e91775bb92239e8920084272d4b36936c105fadb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 5396 bytes
font_01_sfnt_off000101e0.bin
f714ddc681c2f22ef9a364a44ebe48f277590ac3c5b4ed263186e2d2a1d0fe2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 10508 bytes
font_02_sfnt_off000125da.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x125DA 4324 bytes