Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea75923b832dfc6…

MALICIOUS

PDF

77.5 KB Created: 2021-04-29 13:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f7d52a70ed554195a9e421238d78f38b SHA-1: 138e8a74f8bec3fa6e6ab1aa0b7d8615e6e793d8 SHA-256: 6ea75923b832dfc61a6236fad8e342e2caaeeda13df3ba69620caf264955d8ea
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, appears to contain keywords related to appliance repair, likely as a lure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=how+to+repair+panasonic+microwave In PDF document text
    • http://jesofazom.iblogger.org/71800620191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379982/normal_6000558fb8829.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/ljfNFfl/papabekoluta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_6050023af1fa0.pdfIn PDF document text
    • https://cdn.sqhk.co/xitilesuxiw/fhjU0B6/real_carrom_board_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_60216316e7984.pdfIn PDF document text
    • https://cdn.sqhk.co/vugasoveg/gggYZjc/96132309274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_60545b9f8a9cb.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/Diajhf7/kezajugofeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_6023f2d1d6b80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472198/normal_606554bd3fc60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb1e3cd-e137-4e7a-8776-b32d82bfb456/faruxasuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bba01bb-e722-4172-984c-631c13018dc7/64694406661.pdfIn PDF document text
    • http://muzubakow.epizy.com/pavixozulomebud.pdfIn PDF document text
    • http://xatesowogexiwu.epizy.com/algoritmos_de_cubo_rubik_3x3x3_fridrich.pdfIn PDF document text
    • http://fixuwebevu.epizy.com/vutemujaponalulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c696af-0922-4717-a715-1182d82405a0/somimut.pdfIn PDF document text
    • http://zunaxixe.rf.gd/karuppasamy_song_video.pdfIn PDF document text
    • http://najepesirezamuz.rf.gd/31331972881.pdfIn PDF document text
    • http://kopivenegi.epizy.com/16434461971.pdfIn PDF document text
    • http://pekotezubefem.rf.gd/epictetus_discourses_quotes.pdfIn PDF document text
    • http://ketowazozusa.rf.gd/speaking_english_book_download.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_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 5160 bytes
SHA-256: 7205469d8abd5fc28d1aa0e7024957d64bfa0993fc3d0b06cde4054a1052eb2e
font_01_sfnt_off0001049a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049A 10568 bytes
SHA-256: b7b719bf6670af0902d4346061c37179dbd0170eba657a3a6c315ff3ac2b105a

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