Malicious PDF — malware analysis report

Static analysis result for SHA-256 261159514d97ca15…

MALICIOUS

PDF

79.3 KB Created: 2021-04-14 01:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7750e9ecf5513d358c999146d56b05e SHA-1: 5edafe5b4ab628e70252914cc35c36fe0cbda944 SHA-256: 261159514d97ca1553b9b6e3110b8cdbb2e1376b159ce61f995deb356070256d
136 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains invisible links pointing to suspicious domains, with one URL specifically identified as a lure for downloading a secondary PDF payload. The presence of these links suggests a phishing or social engineering attack aimed at tricking users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/strik?utm_term=harvard+assessment+map+covid-19
    • http://themarkuzmusic.com/2826966536ui8vd.pdf
    • https://cdn-cms.f-static.net/uploads/4453902/normal_60275b0762e12.pdf
    • http://gupirigugorixuf.sportsontheweb.net/all_in_one_science_class_10_cbse.pdf
    • http://saleproducts.pro/jilasenifaw3yya.pdf
    • http://triple-doska4.club/one_punch_man_season_2_episode_1_eng3ab7i.pdf
    • http://managerprogram.live/74026897745diw41.pdf
    • https://cdn-cms.f-static.net/uploads/4413474/normal_6036bfee62215.pdf
    • https://cdn-cms.f-static.net/uploads/4407327/normal_5fe7bff4f19c7.pdf
    • https://cdn.sqhk.co/kowukogifaw/ixjejeG/android_developer_accelerometer_tutorial.pdf
    • http://tuxesimufimiti.mypressonline.com/cognitive_biases_in_visualizations.pdf
    • http://damvglaz2.xyz/cmwb_standard_practice_for_bracing_masonry_walls_under_construction_2012oe3iw.pdf
    • http://nowtorrentz.com/74419148899jq9l5.pdf
    • http://autokenn.com/angulo_de_elevacion_y_depresionysvh5.pdf
    • http://fabulouss.space/which_detergent_is_best_for_washing_machine_in_indiapk35g.pdf
    • https://static.s123-cdn-static.com/uploads/4483070/normal_5fdfd0eacfc9e.pdf
    • https://cdn-cms.f-static.net/uploads/4413866/normal_6022e8b79f4a5.pdf
    • http://czecheducation.space/50588774346rfrey.pdf
    • http://interbank.link/anet_a6_cura_settingsddd80.pdf
    • http://mujoxoluvisukid.getenjoyment.net/bad_romance_piano_sheet_music_free.pdf
    • http://fefiwizam.sportsontheweb.net/sojofemijutuda.pdf
    • https://cdn.sqhk.co/mepowokugo/gOigheP/32805431543.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d4aa3fec-8467-48b3-bb52-26f4599eae02/bolaseb.pdf
    • https://uploads.strikinglycdn.com/files/63f6b95b-7f8c-42b3-9beb-e13e32a6dd5d/how_to_save_workbook_in_tableau_public.pdf
    • https://uploads.strikinglycdn.com/files/c32c797c-cc7b-4825-9817-c7628625ac1f/como_hacer_una_oracion_de_guerra_espiritual.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_off0000f67f.bin
16c7304a680b765bf30386b67109a9196474eb368804807944aff3d9d9817a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 5448 bytes
font_01_sfnt_off00010902.bin
9366c9a38afa519e8828402b78602923150f3e3f94039a1442ba8a332e95afa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10902 11296 bytes

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