Malicious PDF — malware analysis report

Static analysis result for SHA-256 682cbfc863e71b31…

MALICIOUS

PDF

90.9 KB Created: 2021-03-16 20:29:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b20c8a9300c5f4cb99dd1fa795580bcb SHA-1: 28d79dffbedd504c75bddf9335885c0970fafd76 SHA-256: 682cbfc863e71b314d58bd7e4482bc8960fa974517b997096621e9d033891881
186 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 disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://seumenha.ru/strik?utm_term=think+highly+of+meaning+in+hindi PDF link annotation
    • https://notususapi.weebly.com/uploads/1/3/4/0/134012365/jebot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_603776fd0537c.pdfIn PDF document text
    • http://vojemodipu.sportsontheweb.net/arduino_uno_programming_code_for_traffic_light.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365642/normal_604867890e1ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392660/normal_6005bb306412a.pdfIn PDF document text
    • https://devitigofe.weebly.com/uploads/1/3/1/0/131070043/27a4ab5b0eb0.pdfIn PDF document text
    • https://cdn.sqhk.co/vonixilavot/jjfghii/tibemirij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368495/normal_5ff8cd17d5b0e.pdfIn PDF document text
    • http://dalidusiz.mywebcommunity.org/febajofemajonip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502500/normal_60505fb242184.pdfIn PDF document text
    • https://cdn.sqhk.co/muzolorakow/jyjcjb6/xinujaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/dOAicig/pobuwufagudegilopi.pdfIn PDF document text
    • https://jezipupokegem.weebly.com/uploads/1/3/4/0/134042816/145ac.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/present_perfect_tense_words_list.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/supply_chain_management_program_online.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/garmin_430_data_card_update.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5fe91624a65ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_6018a0f1aa934.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/iIghhjq/birthday_cake_with_name_and_photo_edit_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_601f39e8acfbc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f17a060-b06f-4d70-bde4-32e0fd8ba04c/jiginokoretowivopejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7899571-5883-4099-a4ac-6550308217f0/momo_michael_ende_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486f90b4-9f6c-43d3-b52a-b3d594b2d45a/how_to_work_an_8mm_projector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27802ed5-7078-49fc-98f4-8d566ba55290/56395909684.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 5160 bytes
SHA-256: 3a8a3ac60a40063756df30d8f0b7967afad884a8834c8dcffa859353af2b683b
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 11384 bytes
SHA-256: 8452071d5ed6497e31284c9f30775c58c987ebb0c3e66e14b7b5829ff1006ba8
font_03_sfnt_off00013724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 11728 bytes
SHA-256: 278fa7e8b7a6f731bc68d3606d1dce3429eec3061e1e9cc2c3bc669b42068ab2

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