Malicious PDF — malware analysis report

Static analysis result for SHA-256 271efa1cd04f200f…

MALICIOUS

PDF

81.3 KB Created: 2021-04-03 04:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c133ec329e727ec897f709e1ea9c1e30 SHA-1: ee111986a47ece87ed3c20579e0b5100132b24bd SHA-256: 271efa1cd04f200f8ed20f208c6c672dadb4f1ac23a853f727164a151f313e95
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the embedded URL 'https://bologen.ru/award?keyword=major+depressive+disorder+dsm+5+pdf' suggests a lure related to a specific search query. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=major+depressive+disorder+dsm+5+pdf
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/dufudulopuduxemozem.pdf
    • http://raxewaponoxiv.mygamesonline.org/moxiwotude.pdf
    • https://cdn.sqhk.co/zufosupiz/ja1iidP/molalujabatufedebebaj.pdf
    • http://mx50off.info/blouse_design_back_videocbvzi.pdf
    • http://7lessons.space/dunkin_donuts_turkey_sausage_wake_up_wrap_caloriesjv55s.pdf
    • https://favobilumosuxo.weebly.com/uploads/1/3/4/7/134733594/kegufezigudaxulap.pdf
    • https://lusizemanu.weebly.com/uploads/1/3/4/1/134108609/5879842.pdf
    • https://cdn.sqhk.co/fotajoge/chd9Mvp/wood_project_ideas_for_christmas.pdf
    • http://nulivanofika.mygamesonline.org/acrylic_paint_techniques.pdf
    • https://cdn.sqhk.co/fagijopi/gjh0jgL/14428689281.pdf
    • https://cdn.sqhk.co/debefuki/oihgXha/76905178037.pdf
    • http://rolorutebu.sportsontheweb.net/pdf_file_convert_to_word_i_love.pdf
    • http://juilopkiretlo.ru/19148961783k0doj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0d52958e-0bce-4137-bd90-f753c1e42495/jodopominutukisuveme.pdf
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_5aa806c499314786b23bcd744ef5c366.pdf?index=true
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_d6e7b11bf38048d1a3bf76f37b9338db.pdf?index=true
    • https://uploads.strikinglycdn.com/files/64913859-8e78-468e-84c8-9e23fde162bd/75370324540.pdf
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_b9498b2fd1574858932bfa8068675a1c.pdf?index=true
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_8f0990e86fed4fa5ba074d7a8c522cca.pdf?index=true
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_36011147ed9847dc9d587b3466320466.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8e5b8d58-30bd-449a-b2f6-6c14dab78f55/how_to_put_a_scope_on_a_daisy_powerline_880.pdf
    • https://uploads.strikinglycdn.com/files/c44218e4-5c16-49fb-883d-0d7b9053b644/menobakosopik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e3.bin
9a156c8eb4dcc29bacea0b2bde05fe73967a71a8eacbf60cfc435d8954347af1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 5420 bytes
font_01_sfnt_off0001135c.bin
a357d70678e88af95a3e96a31290e495bdaa23063d48010cc0d29680fc98632f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 10580 bytes

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