Malicious PDF — malware analysis report

Static analysis result for SHA-256 0230bf501ad036bd…

MALICIOUS

PDF

83.0 KB Created: 2021-03-09 22:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 87cc1c0febe3cce82562821c8c1b6832 SHA-1: e146ca5c9b8993d0147cab2d9c75bb3227e2bddd SHA-256: 0230bf501ad036bd0346f2203553d9b6ef20f7f58cf43aaceed44c45d1f9a5fc
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 or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/123?utm_term=airborne+geophysical+survey+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419437/normal_6012b1bdbceef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407789/normal_603f4e7d329d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_601d85fa10f65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_6015704fc84b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475864/normal_5ff820b289be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501486/normal_60221407ca247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_600b67f61b659.pdfIn PDF document text
    • http://aires.fun/star_trek_the_next_generation_season_3_episode_15scof2.pdfIn PDF document text
    • http://topmassage.net/70747274091ktxvg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418985/normal_5fdb805bc67ff.pdfIn PDF document text
    • http://noverst.xyz/art_wallpaper_hd_zedge_iphone785lk.pdfIn PDF document text
    • http://accface.in/2300707523453lui.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_d4d8d602431b44d496b91061718c608c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/irregularly_spelled_words_worksheets.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_c9145f2693004894ade815d06a41ca23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34dca956-e59a-4d98-91b7-b39322ed6810/57462151435.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/fapipujilamu.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_1d6efdd9dbb34e4b8c2ac920edd5a876.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1519f9af-a7e7-4984-9194-3e45a27bc965/dagodaloto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89bb7353-2b13-44e9-bfee-79cf3a3dbaf1/44797208780.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_8a81a64557504b3681dc12bdae5bd5c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfed9710-9243-4194-89ad-a6fd713e6e70/manual_rex-c100_portugus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a666edd5-4377-4286-9511-f1cd8d9ee2a2/wisurugifufetaretituxom.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 5708 bytes
SHA-256: f1fbb5fd25d1178e4dadaf8e50b59985d1f31ea5677215fb66a5a4ec21b661bd
font_01_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 11268 bytes
SHA-256: 7312d6581a221fde1174067724dca1ed84e0b68c0d088babdb17cca547e0fddd