Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fbf861176bb0e1…

MALICIOUS

PDF

88.5 KB Created: 2021-03-11 23:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71ff4a98bb581683dc44b5d685e54929 SHA-1: 99a599250500fb83b0303bc0ab889a62483c04e5 SHA-256: 91fbf861176bb0e19ee3ac1d67bea7a51f265d1a2ca9ca2e98a5a81bf57981f1
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the presence of numerous unknown URLs indicates a likely distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://lozipotod.ru/123?utm_term=commandos+mobile+android
    • https://tedumevoseviman.weebly.com/uploads/1/3/5/3/135311532/xemamuri.pdf
    • https://fusajowaxoxa.weebly.com/uploads/1/3/5/3/135344195/mexetigadukidizo.pdf
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/b244b6d.pdf
    • http://larebalin.mypressonline.com/the_saxon_stories_tv_series.pdf
    • http://kamikofonem.mygamesonline.org/derev.pdf
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/2231318.pdf
    • http://fosipuzo.mypressonline.com/59918374448.pdf
    • https://gazavado.weebly.com/uploads/1/3/4/3/134331045/wemuzifijezisodejim.pdf
    • https://pigegiwoxare.weebly.com/uploads/1/3/5/3/135385020/7758671.pdf
    • http://mirumumavetifun.mypressonline.com/what_is_a_custodian_of_records_affidavit.pdf
    • http://mevesepegubisis.scienceontheweb.net/mifepaxo.pdf
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/falirudasojeboxujo.pdf
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/jidosafe_podelixipabif_vukike_dugemivexowu.pdf
    • http://navevukosuso.mypressonline.com/resumen_de_las_escuelas_psicologicas.pdf
    • https://ludodufapagita.weebly.com/uploads/1/3/4/6/134616483/3515649ce0ed.pdf
    • https://limikasideg.weebly.com/uploads/1/3/4/4/134446439/savizobolejurorisuka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zalomi/should_trees_have_standing_towards_legal_rights_for_natural_objects.pdf
    • https://s3.amazonaws.com/musoxifuvitalo/jammu_university_marksheet_of_b._ed.pdf
    • https://s3.amazonaws.com/tinivukedeta/detroit_slang_what_up_doe.pdf
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_d0e5bc591d22421bad3923e54f137f17.pdf?index=true
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_8553d625cdde49b8ba68f621c90aab50.pdf?index=true
    • https://e1bd05e7-a2ed-43df-b5fc-9bc8ee0b1a84.filesusr.com/ugd/08acf3_a7fc9b659cb04c07ab2f71c21e104833.pdf?index=true
    • https://s3.amazonaws.com/mexesazaxasa/72180250294.pdf
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_085e2c76f28a4667a4c113eaa16d5a1b.pdf?index=true
    • http://pekafujojef.onlinewebshop.net/beretta_a300_outlander_semi-automatic_shotgun_reviews.pdf
    • http://bowegasobufur.myartsonline.com/bobopegusigewetakoga.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc65.bin
0167e4bcbbca7967f2b7db1a19606e6f311e091c7296e9fe379dacbf0dfeff7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC65 5124 bytes
font_01_sfnt_off00010e6a.bin
66a0b658d00f406a15a203cda647779ae2923af5b6f89d6b31dd676b30fbb033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 4844 bytes
font_02_sfnt_off00011eb0.bin
2181fbaa4d54182d9d9843c4c95d39ea6cd4056bd61f28bba480f10b4ce9dcc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 10976 bytes
font_03_sfnt_off00014408.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14408 4324 bytes

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