Malicious PDF — malware analysis report

Static analysis result for SHA-256 671422552d4ee34c…

MALICIOUS

PDF

86.7 KB Created: 2021-05-15 04:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8e6519f4d5f649e12f8d7df817746fb2 SHA-1: 24ba038bb96d8ddb2a0357daf55575032e2c9af4 SHA-256: 671422552d4ee34cb7361db9e9d2a516d6f1ca01a0e11cd25afada6325074795
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://baarspo.ru/strik?utm_term=magical+beasts+and+where+to+find+them+2+rotten+tomatoes PDF link annotation
    • https://tofikopu.weebly.com/uploads/1/3/1/3/131381225/zaxokanolefiwavidal.pdfIn PDF document text
    • https://kexulisil.weebly.com/uploads/1/3/4/7/134762119/00d61.pdfIn PDF document text
    • https://cdn.sqhk.co/merejipofeto/eghuifG/gagedawa.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/4qChhKc/tubby_todd_eczema_baby.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/9234d8.pdfIn PDF document text
    • https://muduzefob.weebly.com/uploads/1/3/4/0/134018051/lanixiviw.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/Mig1UYs/451474686.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/jgidoij/photo_gif_maker_video_apple_live.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/volikirojodux.pdfIn PDF document text
    • https://sodikisug.weebly.com/uploads/1/3/1/4/131437766/timorevibupona-taxumug-kovebukipixuto-koziwobosijadud.pdfIn PDF document text
    • http://duxuliba.22web.org/18121832225.pdfIn PDF document text
    • http://dakijexok.22web.org/cessna_172s_poh.pdfIn PDF document text
    • https://danudaxeki.weebly.com/uploads/1/3/5/2/135297903/1471977.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/9959f3426df250.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://uploads.strikinglycdn.com/files/063703fc-4d1c-455f-ade3-78b0a18f2652/buwububutaxibamonux.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_c24a45eccf82416397ef863b9f18c075.pdf?index=trueIn PDF document text
    • http://bameromaxaw.epizy.com/guidecraft_dress_up_storage_center_white_g98098.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_dce4a2ab40de44ccaf254e722ee29f91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e996744-4380-4a41-8a7d-5e44f69c9338/tuvezof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ff92a2d-62ae-4c93-89ab-bd42ae174dc6/stihl_fs90r_trimmer_parts_diagram.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_1c5f7bb8f20d4255bf58c0030f444ec8.pdf?index=trueIn PDF document text
    • http://kuxomexepus.epizy.com/rotation_and_moment_of_inertia_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa870964-3c2e-42cc-bbee-1648c23364b7/army_apft_standards_sit_ups_female.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_bac70d56e92e4fccba667ceb3aec904e.pdf?index=trueIn PDF document text
    • https://06b91503-bda4-4bbd-a69c-520552d4e402.filesusr.com/ugd/07c5d0_6b5d43f2d4444cd7a3040b7c651ad1e5.pdf?index=trueIn 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_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 5592 bytes
SHA-256: aac87b23f9eb5c46667600bb41829189f817ca844ef22323568ec767c378b592
font_01_sfnt_off0001164a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164A 11744 bytes
SHA-256: 472cfdeb991fb7d63230a383fb6579413d244bbdcc8c5789cea277d56f6299fc
font_02_sfnt_off00013e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E26 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3