Malicious PDF — malware analysis report

Static analysis result for SHA-256 944543811f7db569…

MALICIOUS

PDF

72.2 KB Created: 2021-03-08 19:19:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9db4db5ecaa7dbaf0d345d275eb4c4e6 SHA-1: fa44c5a2a9d62b9a6877d48f50ac50cf0917ff85 SHA-256: 944543811f7db56934846d2eb91004513e1944b19241d68b65522953332a6f65
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=precision+machining+technology+2nd+edition+answer+key PDF link annotation
    • http://momentshop.space/duvametekaral2kxbm.pdfIn PDF document text
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/girimod-rogajumuwow-dasajukipuzuzo.pdfIn PDF document text
    • http://businessmentality.com/54311956746ux5cd.pdfIn PDF document text
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/viwovanokako.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5ff6847568965.pdfIn PDF document text
    • http://yoganchik.space/96947661072vz82q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5ff8282da3f6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462351/normal_60176d5c3715c.pdfIn PDF document text
    • https://dulewidojupetor.weebly.com/uploads/1/3/2/6/132695372/jajezule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_6013790b22b19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474220/normal_60401d0b7a3c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475734/normal_601332a5379fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_600e13b47813b.pdfIn PDF document text
    • http://small-italy.space/payment_request_letter_templatewmyl5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/a1c56f27-ee7d-40cd-90d9-2317f9c72363/30_day_vegan_weight_loss_meal_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/823db6f9-8358-416d-ab4e-d5ebf54662f8/how_to_backwash_sawyer_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9964f754-5b81-4a02-9a25-6ef922fc8d83/14000_things_to_be_happy_about_epub_vk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6078ff8a-04c1-4563-843a-ff58ecc23159/gotapivawepavesele.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/what_is_the_book_mrs._everything_about.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/badrinath_songs_please_come.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_off0000d07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07D 5532 bytes
SHA-256: 5bf1190bb1a5ef21c4c1a257e095e71ec536f7d966f2857acb15e3d861e0be0f
font_01_sfnt_off0000e326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE326 9940 bytes
SHA-256: 4dabc314beeca1da81fbe0f43bdb0eff1b280cc332726950eecaea9bb81e1f79
font_02_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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