Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c4e788894efd32…

MALICIOUS

PDF

77.9 KB Created: 2021-03-15 23:53:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 81fec395bbf351f64774e658253e0d2a SHA-1: fa5abce3678ea88ce6b1be050dfdabe9e98d0dfe SHA-256: 48c4e788894efd32ceecfae53db5e4c5aa2fd7778f31f46a449e9d3c2d4e7069
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to suspicious domains, and heuristic analysis indicates it's part of a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution by redirecting users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=cbse+class+12+sample+paper+2020+pdf PDF link annotation
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/zadiduj.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/bovurugizo.pdfIn PDF document text
    • http://dowedunazab.iblogger.org/zubosibivo.pdfIn PDF document text
    • http://kdghy.online/how_to_measure_clothing_chest_sizeah6wq.pdfIn PDF document text
    • http://natiral.space/steam_keeps_ing_then_stopping61yed.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/kugufobututo-putadu.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/6451e43c-3876-42c4-bc5a-85fa08c3ffb7/50263103382.pdfIn PDF document text
    • http://fajesunuk.rf.gd/tasetirovelevojeriguro.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/98829763769.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/little_big_farm_apk_mod_hack.pdfIn PDF document text
    • http://kesobiw.rf.gd/adobe_xd_free_for_windows_8.pdfIn PDF document text
    • http://xubixetumed.rf.gd/528856074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59108552-132f-40bd-a9a3-ef1750d027cd/criminal_law_books_for_beginners.pdfIn PDF document text
    • http://navozilapeso.epizy.com/71515388506.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/43651527957.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5672 bytes
SHA-256: 03999d28481e0fd3a856b24fc1a35db6835d3031ac34d978cac3ccaa6c2dd659
font_01_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 10400 bytes
SHA-256: 02aec00646745e5e05de6e596e69df281c444e7e2efca376cfbcba1d03feb2ef
font_02_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 4184 bytes
SHA-256: f3a0b22bb960fb2c5cc9ef7988ae84b3238b68435f995ca6b525f7038e8e36ac

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