Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee42905263187bcf…

MALICIOUS

PDF

76.1 KB Created: 2021-03-22 16:45:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a0c0b589c5d0be06a3a5990e1cffc6d5 SHA-1: b0fade274cb286b6ff45dcf679d9dd25260859df SHA-256: ee42905263187bcf7e059b1ac5843f03fff2c1c3f748a654a0e71f539c22ce82
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary URL, 'https://crophysi.ru/award?keyword=basic+acrylic+painting+techniques+pdf', is flagged as malicious. The file also exhibits characteristics of a link farm, with many links pointing to disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/award?keyword=basic+acrylic+painting+techniques+pdf In PDF document text
    • https://lajisoxe.weebly.com/uploads/1/3/4/4/134435468/db66392ba3e8239.pdfIn PDF document text
    • http://itmax.info/what_was_the_mesopotamian_religion_calledgfx1x.pdfIn PDF document text
    • http://astropsychology.website/teburevunixetiguxasakag23o4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366359/normal_5ffb5a2a219ee.pdfIn PDF document text
    • https://polivepuba.weebly.com/uploads/1/3/4/5/134582029/sijinibonuviro-jamik-sajufufuxenazux-pipigavozegapok.pdfIn PDF document text
    • http://moymagazin.xyz/noma_5hp_24_snowblower_partspwn1i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379241/normal_5fee6dd72c3db.pdfIn PDF document text
    • http://itclick.pro/ravpower_filehub_plus_app_for_windowsatnr9.pdfIn PDF document text
    • https://fudewuwadume.weebly.com/uploads/1/3/0/7/130740250/mivetumazere.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/how_do_you_charge_wireless_beats6o8vj.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/rfid_based_student_attendance_management_system.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
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_a10a8d74b30a4d5693496864a40a7c55.pdf?index=trueIn PDF document text
    • http://zotubune.myartsonline.com/grigori_grabovoi_methode_trke_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/tesagigofa.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_5632c1b6fc764e2983d2104199de0ca9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/dekunipivoximilome.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_cb8709c26f404f3a979599acc2d9fc7d.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_3770fd5396744f78af8c84e7987dd64e.pdf?index=trueIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_513ed6a9002642d2bc3d7a53481a56d6.pdf?index=trueIn PDF document text
    • http://bememikat.onlinewebshop.net/black_boy.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/99149156130.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/animated_icon_pack_nexus.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_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 5468 bytes
SHA-256: 3f201bbebdd9eaad933d417018d6b6658c2587bbe92d0d8feb766f87012992dc
font_01_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10604 bytes
SHA-256: 0a2c2dacbe4c7fefd61dba82346160f4cc5e544ee29aeda6638f923c1e04f276
font_02_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71