Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15a046145c5e48b…

MALICIOUS

PDF

91.0 KB Created: 2021-03-25 22:43:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8b6b18d5cd5bbbeac9ba5de9a9e28697 SHA-1: 6d657cc6ccd65f87d8491694d7beea4357730ebd SHA-256: b15a046145c5e48b019f9591507336ecfc28836c556189450ec106b4ee2c8fd3
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous external URIs that likely lead to phishing sites or malware downloads. The presence of a large number of external links, some on disposable hosting, strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/award?keyword=sahasra+ak+arabya+rajani+bangla+pdf+download PDF link annotation
    • https://cdn.sqhk.co/bekutojeke/jHR0Azi/pink_neon_racerback_tank_tops.pdfIn PDF document text
    • https://xigukiburid.weebly.com/uploads/1/3/2/7/132741693/2870e75ad198bc5.pdfIn PDF document text
    • https://jirilerimu.weebly.com/uploads/1/3/5/9/135967849/jonoliba.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/ifhcgfs/sorepifi.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/gcggeJw/7_wonders_of_the_natural_world_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/dunafafaxen/hjLhfRa/gun_shooting_games_apk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/gjthe9o/toggle_translation_to_french.pdfIn PDF document text
    • http://ruxipivufaditij.22web.org/alias_grace_full_book.pdfIn PDF document text
    • https://cdn.sqhk.co/sosexazefip/hhbifjh/cat_runner_decorate_home_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sevalaturi/Nifggjh/icloud_photos_won_t_sync_to_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/iigchhz/regiravapovekanakuvavun.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwovar/dwjgtgf/70978358091.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluzezufe/jUdcjab/24974553213.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/hjfgjWQ/29331497564.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d635753-407c-4f0b-97a1-26fb355e6a7f/how_to_unstick_ice_maker.pdfIn PDF document text
    • http://wulakutagugizi.rf.gd/47906389813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08cfd072-2d78-4c64-a3b2-f338388adee7/dr._wellness_x-3_spa_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17221f92-fc41-4e21-a709-67444046de64/xojumivebuxidajuzefim.pdfIn PDF document text
    • http://magonusu.epizy.com/brisky_new_songs.pdfIn PDF document text
    • http://wakoxoxotof.epizy.com/39795314172.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81B 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 5880 bytes
SHA-256: 615ed00597ae7220bc44bb39624a47c1554da2f09cd770553309c8eb6409b3b8
font_02_sfnt_off00010d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0F 2752 bytes
SHA-256: 7dd573b6ff886eb11583017a37792bc84cc8f6638be5f6bfbba47df13931cab4
font_03_sfnt_off000118a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A9 10008 bytes
SHA-256: e679dc958d5030669efe4ebfdb0ab2fa24c92cc25e3e0b4a95c45ba4cb4e9548
font_04_sfnt_off000136c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C1 11636 bytes
SHA-256: 3d5af0b0c315d0d430d2362765218af5b05f9dafa0d3f007ce6ad9fbb13ae1f5

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