Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc29a78a2abad80…

MALICIOUS

PDF

75.8 KB Created: 2021-03-19 01:18:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 934bf3a92e0adcfcf1b233001b72182a SHA-1: ee43d9eb736a89380bd069b05c935d415ce90e14 SHA-256: 3fc29a78a2abad8082b462972f62b3d73e1531fc4256d7e55a760535b2ac33a8
156 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to manipulate search engine results or distribute further malicious content. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=living+religions+pdf+free
    • https://xasirazabad.weebly.com/uploads/1/3/4/6/134699738/wevugo_femifiredufuto_fulidibovuxufat_daxekisumamut.pdf
    • http://xekedibu.iblogger.org/peavey_vypyr_15_price.pdf
    • https://jafedojinow.weebly.com/uploads/1/3/0/9/130969492/665726.pdf
    • https://cdn.sqhk.co/gebitasixa/g0ijdii/grain_absorption_rate_calculator.pdf
    • https://tajamopem.weebly.com/uploads/1/3/4/7/134745730/tusaxewo-lipeje-wanulitabotor.pdf
    • http://wafowufopenu.22web.org/74428924815.pdf
    • https://fepaxumezo.weebly.com/uploads/1/3/4/3/134320712/ad7e24716.pdf
    • http://nupigit.22web.org/8018397546.pdf
    • https://cdn.sqhk.co/fogobewataja/Chbggib/dash_till_puff_2_mod_apk_android_1.pdf
    • http://dodemawaj.iblogger.org/91472921527.pdf
    • http://wogizejelalod.iblogger.org/9082212060.pdf
    • https://pasadaxadug.weebly.com/uploads/1/3/5/3/135390708/7a58f3c0.pdf
    • http://retilokufiz.22web.org/bharathiar_university_books_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bikikifuxax.epizy.com/wamoxawubezuwodofin.pdf
    • http://wefugegori.epizy.com/netgear_n600_dual_band_router_wps_button.pdf
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_98c0ea9fb24f4b228ba5e0710e14f310.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8447e3a7-34bc-4245-850d-74c501998818/97398881006.pdf
    • https://uploads.strikinglycdn.com/files/e909ff45-dfbc-4389-8cda-e06cab026b8d/how_to_take_permit_test_online_florida.pdf
    • https://uploads.strikinglycdn.com/files/e3da15a0-2424-4581-bfba-6f493ad6aee3/rizaseritejow.pdf
    • http://wekidezeze.epizy.com/fossil_record_worksheet_middle_school.pdf
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_f89d615617824b11bf840d3421516cfe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43b7cde8-1f72-45e0-beab-f7a42045e571/how_to_replace_a_circular_saw_cord.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfa.bin
0a4a5371d3d64f8a28106a633f8870d956db5ea6deff6bb75144d1dc4caf9a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 5000 bytes
font_01_sfnt_off0000fd25.bin
c3f7bab3aa6009b4dc1336b7058e04f325cdf40b22b1171d0b05c812696fe8a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 10788 bytes

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