Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d72d8ca1293e752…

MALICIOUS

PDF

82.4 KB Created: 2021-02-04 10:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 79c656993bbb1e9de873ed9559eb44d5 SHA-1: 5b202a5059037646cec3120f422727cf4a93f0b9 SHA-256: 3d72d8ca1293e752eba35d0a4dcab41163152747946cd5d50ef1de2e4a1e102e
184 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, containing numerous embedded URLs. One critical heuristic indicates the PDF links to known malicious redirector infrastructure, specifically citing 'https://yafferge.ru/wb?keyword=circle%20left%20font%20free'. The document body is heavily obfuscated and unreadable, but the presence of multiple links to disposable hosting and redirectors suggests a phishing or scamming attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=circle%20left%20font%20free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386839/normal_60148153492fb.pdfIn PDF document text
    • http://jibifiva.22web.org/56726270367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_5fd9014f6f244.pdfIn PDF document text
    • http://republvinb.fun/le_chevalier_idal_tapuscrityr5hb.pdfIn PDF document text
    • https://cdn.sqhk.co/zisubiziwu/tsyjdkc/keyboard_piano_for_beginners_songs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478123/normal_5fcc1b424b7ce.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/e5X2ggg/freeway_honda_inventory.pdfIn PDF document text
    • http://itverys.space/rocketman_streaming_may_2020bwhev.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/nuwidajonorajanen.pdfIn PDF document text
    • http://circulshtangcalip.website/auto_followers_on_instagram_app_downloady4a4j.pdfIn PDF document text
    • http://keep-travel.com/66582488298rerxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ninukak.epizy.com/18845891254.pdfIn PDF document text
    • http://binawojojin.epizy.com/fafovo.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/citizenship_test_questions_and_answers_in_punjabi.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/cuneiform_tablets_description.pdfIn PDF document text
    • http://dilabopitomosif.epizy.com/merriam_webster_dictionary_free_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/ivoclar_bleach_shade_guide.pdfIn PDF document text
    • http://zojopek.epizy.com/walt_disney_company_annual_report.pdfIn PDF document text
    • http://zexitan.rf.gd/bhojpuri_song_2019_dj_tinyjuke.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/lojavenivobu.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/adkar_malayalam.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_off000107a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A2 4392 bytes
SHA-256: b488703acfdfd7451a707e60e9fb06bca2cb6c36583b76f55a7b1590f649b8eb
font_01_sfnt_off000116a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 11112 bytes
SHA-256: af349e41a07985972b98a43e2b206269423d9ef029f3248f441026be47058019

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