Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca03c1bffb9a835…

MALICIOUS

PDF

78.9 KB Created: 2021-03-14 16:18:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 740144c0a9e7073a77ed026cf6b9ee5c SHA-1: 2879d332826368434a447d62de79b062ba4d4c8c SHA-256: 7ca03c1bffb9a835efa48073ddc0e66c26c1295d1e92371465b6d234b0a3fa7d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm point towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://ponafet.ru/123?utm_term=back+to+the+future+480p
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/92c0b609a7760.pdf
    • https://bodonovovo.weebly.com/uploads/1/3/1/6/131607174/c2bce843077b.pdf
    • https://rijamukomebojo.weebly.com/uploads/1/3/4/5/134585881/xozunupemagol_jovunuduxafuxux_gakave_bebunizazopo.pdf
    • https://cdn.sqhk.co/zanudiwageg/bkagehg/minecraft_bedrock_edition_lucky_block_servers.pdf
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/3126804.pdf
    • https://cdn.sqhk.co/kezomerameki/igjjcQa/world_at_arms_hack_apk_2018.pdf
    • https://pujowelitolav.weebly.com/uploads/1/3/1/4/131438356/kivawoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tikixowogozomi.epizy.com/54126473704.pdf
    • http://lejibop.rf.gd/56042640420.pdf
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_6bd5ec369fa441b9831804b5f8f535e2.pdf?index=true
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_514b60c15b8145668bc3159d85184da1.pdf?index=true
    • http://basonitezof.rf.gd/2005_dodge_ram_1500_5.7_hemi_block_heater.pdf
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_15dbe053b02746a0badfca1100097d9e.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_60bcdb01269b468ba6620517cceb2c12.pdf?index=true
    • http://suwulinivez.rf.gd/jlab_wireless_earbuds_charging_time.pdf
    • https://uploads.strikinglycdn.com/files/a4b84347-270e-42a4-ba4c-bbf612add031/libro_el_poder_del_pensamiento_positivo_norman_vincent_peale.pdf
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_0b8b3f14dba3498fb070b81ef2d5de7e.pdf?index=true
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_6d25117bed2e4d8db24903c50d857318.pdf?index=true
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_f4b825bb07f441d5af1dbc3424afe8ad.pdf?index=true
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_da80c0a71d8f4eeea25bd996aaecf34a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/df020385-22e8-462b-a754-1a9d0fbf7b7d/my_toshiba_tv_wont_turn_off.pdf
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_d973749c28244767960f8e8b3d572f2c.pdf?index=true
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f0.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F0 6744 bytes
font_01_sfnt_off0000e8d5.bin
8818873573778c289f118cfc7a9e09bb2f5b09f7a7ad91c7b088ddfee47bbe5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D5 5156 bytes
font_02_sfnt_off0000fa73.bin
b8fa95ee60c6520c2bbbe543511140ceb85484478dc1e492b39276641cbb9fc8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10480 bytes
font_03_sfnt_off00011e4c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4C 4324 bytes