Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e50dafba6f483b2…

MALICIOUS

PDF

81.9 KB Created: 2021-03-27 10:36:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 02a7c97500932ca873355692c6256c67 SHA-1: 5e7256a82e76f6a568b923ed3eb3e938d9542b0b SHA-256: 5e50dafba6f483b24e5f9511bff1fde40454e5502c1b8b7d8a35f9415d7f9a2f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains text related to a 'Nordictrack e2500 treadmill manual', which is likely a lure to attract users to malicious or spam websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://bologen.ru/wix?keyword=nordictrack+e2500+treadmill+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391899/normal_5fdc3692100c9.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/dd87946d54dce3b.pdfIn PDF document text
    • https://ripafikumitepi.weebly.com/uploads/1/3/4/6/134622323/gunik-ritoxi.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/bihhjc5/kits_dream_league_soccer_2019_juventus_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427091/normal_605bafa798088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418963/normal_5ff9fe9a1e7f9.pdfIn PDF document text
    • https://komiwafaka.weebly.com/uploads/1/3/2/7/132712661/xisipalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_604f422981513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_605577ff52205.pdfIn PDF document text
    • https://cdn.sqhk.co/wafexumu/LihAhbE/vodugodumufojar.pdfIn PDF document text
    • https://minadefimufev.weebly.com/uploads/1/3/4/6/134635785/2199112.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366653/normal_602d70e63cb0a.pdfIn PDF document text
    • https://mimifutugeteze.weebly.com/uploads/1/3/0/8/130874087/1041091.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_600f3868d0c29.pdfIn PDF document text
    • https://cdn.sqhk.co/nivodoruw/iaEjfLO/best_ninja_foodi_cookbook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_b5d1d0beb674478dbcd9c309a2085007.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5e408f-fd7b-434e-bd39-7e3b4237eb76/ariston_washer_dryer_combo_door_wont_open.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85833b97-0254-4a11-b5db-025c245a5602/learning_to_read_and_write_frederick_douglass_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9badc2ca-7494-4626-adae-a1b0760539fb/4690191923.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f3d0476-2f03-42a0-b6ce-7d9319aba1c6/relapse_prevention_plan_during_holidays.pdfIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_dc735a7b67834334a49f284c6298672a.pdf?index=trueIn PDF document text
    • https://dc5983eb-04eb-4341-be6e-5f763cf8c8d0.filesusr.com/ugd/979c04_74c7a5fef04b4e8cb12ac856b8d337a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd9e09d-14d0-4e7c-ace7-63a18128f91e/79963193029.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_c57c95a76fbe4efba574d7bb7c7c86a5.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 5340 bytes
SHA-256: 21f94a7064987b08349f07f60d8efab1703756216f6c1ee5f6d560e68b08c5d0
font_01_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 11216 bytes
SHA-256: d41d8d4f8e0b8b1d18803ce35e57c60a2acf3a209d9c5c60a2727bc12e8cfaa5

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