Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfca952e6ae58b04…

MALICIOUS

PDF

77.0 KB Created: 2021-04-02 10:40:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: b8ebbde5e5f5ae064524b077473eadcc SHA-1: 2b8ae12212940756610d43e243e3750ebbe883ec SHA-256: dfca952e6ae58b0482e8e4883659d0a3e605c1946e7245c6343853b66083d707
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, likely used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

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://jottigo.ru/strik?utm_term=after+we+collided+release+date+movie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369904/normal_5ff952a860116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_6040069acb2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_603e322651400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367283/normal_600363a7232c3.pdfIn PDF document text
    • http://rugitezeko.22web.org/jajoxijavawisetewigeg.pdfIn PDF document text
    • http://bilapak.66ghz.com/fordham_mba_class_schedule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389586/normal_600e143e5e8a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407081/normal_5fe3ddc622208.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_1c1e073dc9ab441088fa77bffa8f32e0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca5aff9f-e926-43d9-b703-12372bb845d4/cloudy_with_achance_of_meatballs_2_blueberry_chest_hair.pdfIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_a03ee8e64771447b84b2b3de14e784f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5191e545-279d-4f06-a5bb-0ec118c59c66/bufujoxedipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da85bc8-d8db-453c-8d1c-1466a90267e4/cultural_anthropology_case_studies.pdfIn PDF document text
    • http://vutupaxuvidebif.rf.gd/12691745231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fc7ee35-81a0-45ce-b3fd-5210e647a365/zikut.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/soxuwedof.pdfIn PDF document text
    • http://dufedowukej.rf.gd/60132228325.pdfIn PDF document text
    • http://vuxikujare.epizy.com/76192670915.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/why_i_wrote_the_yellow_wallpaper.pdfIn PDF document text
    • https://abe99a74-823b-4c5d-85d6-f8d8de52422f.filesusr.com/ugd/73cc63_61b90bbf9058408287c07c3e40ce895f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rotowan/fojuzapufugobowago.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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 5308 bytes
SHA-256: 6b2a2054d9883e93470acc06d3a547be1acc37e7cee961883b08f90bb08a8f23
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 11264 bytes
SHA-256: d83c6587d8e522e669188e8c7c585274a8de6856960ac2dcb7d131addeedd6ef

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