Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c678bd553064938…

MALICIOUS

PDF

73.9 KB Created: 2021-02-12 10:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ed34f99dc2f87610f9025cf774d67ca4 SHA-1: dcc34ef3326ebb40d9f2e1478b86e55649a0acad SHA-256: 7c678bd553064938cfe5e98586ce325925f6346eed3b5cd8fe30847655b2b10b
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one specifically to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a history question, suggesting a lure to trick users into clicking the malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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=how+to+answer+a+source+question+in+history+gcse In PDF document text
    • https://cdn.sqhk.co/fogibadeku/iiiijcN/ios_store_app.pdfIn PDF document text
    • https://zavigajigufuf.weebly.com/uploads/1/3/1/6/131637719/robedo.pdfIn PDF document text
    • https://cdn.sqhk.co/bidamasegom/jajcXFn/ragute.pdfIn PDF document text
    • https://cdn.sqhk.co/fofimajazuw/RE66ivM/retroarch_switch_no_cores.pdfIn PDF document text
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/4bbd19bd3c118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493541/normal_5ff1264b0ae93.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/hhujghj/tuwojofalusepekagaze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412583/normal_6000bbdeb1a63.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/heLjidQ/blood_pressure_monitor_wrist.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/Ajimgeh/america_s_funniest_home_videos_bob_saget_dailymotion.pdfIn PDF document text
    • http://banobukosaze.22web.org/function_of_vermiform_appendix_in_human_body.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/jjIhhhh/vss_gun_build_tarkov.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/d12a85.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/DibAaLF/46944829966.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jexusapije.epizy.com/33634606689.pdfIn PDF document text
    • http://welididoseburiv.epizy.com/75650118338.pdfIn PDF document text
    • http://wupuwijekoja.rf.gd/32651947363.pdfIn PDF document text
    • http://fujesotes.epizy.com/ppap_manual_current_edition.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_off0000e524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE524 5308 bytes
SHA-256: c5332e4c8cfa9a38c137c1d2808618e73d9d4756bc5b53ee68d7c5f6c22bd721
font_01_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 10148 bytes
SHA-256: b4fabe4669cb2c8f04a5dc3fa4ccb3d5dbae6a44a60c8e8713e780dbcc21ec74

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