Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d1aeb0cc61ce20…

MALICIOUS

PDF

75.4 KB Created: 2021-03-16 22:23:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 79f26b5be7a6d9e5bcb017fd5edb17f5 SHA-1: df3ebd894184e04b5bd915bb72e4219fbc9fc567 SHA-256: 95d1aeb0cc61ce20e997574866321ede9a9025f59f039c4c79c29e8af450c58c
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external links, many pointing to disposable hosting or potentially malicious domains, suggesting an attempt to manipulate search engine results or distribute further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/wix?keyword=text+to+self+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496204/normal_603e8c9e003f0.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/b900e3e.pdfIn PDF document text
    • http://bamiluzigu.mygamesonline.org/wifixedepemakopexega.pdfIn PDF document text
    • https://jadipiruw.weebly.com/uploads/1/3/0/8/130814676/gotomalogufanejobi.pdfIn PDF document text
    • https://medijoju.weebly.com/uploads/1/3/1/4/131452922/6704225.pdfIn PDF document text
    • http://fekowepiz.mywebcommunity.org/41639451837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392474/normal_603556bd8fc9b.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/fKjfhdr/mutually_exclusive_events_definition_probability.pdfIn PDF document text
    • https://sexedevojaboto.weebly.com/uploads/1/3/2/6/132695366/1e79e3d293.pdfIn PDF document text
    • https://cdn.sqhk.co/bajowekununa/bigniax/blades_and_rings_quiz_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/wjgVT55/wolujazuvunerinini.pdfIn PDF document text
    • https://cdn.sqhk.co/dukizukijire/dHS9ijm/jivuvalu.pdfIn PDF document text
    • https://mazerobuwi.weebly.com/uploads/1/3/1/3/131398334/fosibo.pdfIn PDF document text
    • http://jolidulikan.scienceontheweb.net/reloading_bench_stool.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/25616745811.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/32497274184.pdfIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_36d763ddc8a8423bac957428571bfa46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/winchester_model_1200_serial_numbers.pdfIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_86c429fc50a14fda9e06d1cbbe0d69cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/hoja_de_vida_ejemplos_colombia.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/mabaxowasizanoxaxavezewuj.pdfIn PDF document text
    • http://www.readwritethink.org/professional-development/strategy-guides/making-connections-30659.htmIn 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_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 4968 bytes
SHA-256: 272e82c6a73207bd36c4368d11dc6e768a2cc3a82546134fa097a7d6d96bc5dc
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 10696 bytes
SHA-256: 58d89fe70b6199bb3d457900d16286ac7b96ac23297dd04479e42b8a412302ff