Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea740e1600aed61…

MALICIOUS

PDF

76.2 KB Created: 2021-02-23 21:25:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fd0ce806f6457dbc13e26f1558bddb09 SHA-1: 2050a8cc4616ce3478034e4ae2cd196e96887d0f SHA-256: 6ea740e1600aed6198f7b22e419a5e13064f7e56ab0a4038e112afc75ec7c295
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The document body, though partially corrupted, suggests a lure related to 'joke of the day'. The presence of many links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=joke+of+the+day+in+hindi In PDF document text
    • https://radufogerexe.weebly.com/uploads/1/3/4/2/134265868/demudaxedu.pdfIn PDF document text
    • http://kakerusejom.iblogger.org/76920930075.pdfIn PDF document text
    • http://makamar.online/mazapemujaxobuniberoylo0.pdfIn PDF document text
    • https://gorokawuse.weebly.com/uploads/1/3/4/4/134489158/rakomebolaberu_wezet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401525/normal_600fbf2683a8b.pdfIn PDF document text
    • http://vavoferidedodif.66ghz.com/anuraga_karikkin_vellam_film.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fed16beafc75.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499635/normal_5fecd1f92b9ae.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/bedunejavexuti.pdfIn PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/3922829.pdfIn PDF document text
    • https://nabinavupofi.weebly.com/uploads/1/3/5/3/135350319/1eb1e4429.pdfIn PDF document text
    • http://comp-arenda.site/pikovozr86gu.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
    • http://palipesokugukux.epizy.com/breezin_guitar_tab.pdfIn PDF document text
    • http://jigiwema.epizy.com/short_term_career_aspirations_answers.pdfIn PDF document text
    • http://desixomagi.epizy.com/ben_sherman_t_shirt_size_guide.pdfIn PDF document text
    • http://gaxegumulot.rf.gd/cartoon_photo_maker_apk.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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 4632 bytes
SHA-256: 3b042fe5304a3a21c4439e5cc00d444b9f2d52301b34f763aeb0dbdd7e66e823
font_01_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 10208 bytes
SHA-256: c112bc4878cf3e5b4ccc38c19b6aadc63a4e5cc17ed4f5bf005af53fd5f9c1c1
font_02_sfnt_off00011564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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