Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ba68e08a39b71e…

MALICIOUS

PDF

85.5 KB Created: 2021-03-30 11:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5426279d949377dafcd4184babf9fed4 SHA-1: 764b26005082bd134a2f4cc6a872454999d284a1 SHA-256: 50ba68e08a39b71e589bc0ff7b2e84d01b736ea71df645429fc241ae03a27710
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external links, 'https://nipisod.ru/wix?keyword=3.7+direct+variation+answer+key', is flagged as unknown reputation and is likely the intended destination for a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=3.7+direct+variation+answer+key
    • https://cdn-cms.f-static.net/uploads/4407327/normal_6047d13d7b2ea.pdf
    • https://cdn-cms.f-static.net/uploads/4489598/normal_5fd62d3907062.pdf
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/982601.pdf
    • https://cdn-cms.f-static.net/uploads/4473064/normal_60517ce313190.pdf
    • https://cdn-cms.f-static.net/uploads/4463308/normal_5fdace947fed2.pdf
    • https://gupuletafajural.weebly.com/uploads/1/3/0/7/130776102/1156279.pdf
    • https://static.s123-cdn-static.com/uploads/4501660/normal_5fe4d9c18bc8c.pdf
    • https://gunutusubev.weebly.com/uploads/1/3/1/4/131437775/koragam_tugovomilutaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4b90959d-9248-4c59-9152-4b75fff6fa74/37498017394.pdf
    • https://uploads.strikinglycdn.com/files/d55f3fd9-b790-4e45-a496-5fbc273e5d06/what_would_you_do_in_first_90_days.pdf
    • https://uploads.strikinglycdn.com/files/20c31bb6-7e83-4ec1-934d-833360546642/how_much_is_the_drivers_handbook.pdf
    • https://uploads.strikinglycdn.com/files/52aac8b6-c3e7-4715-9596-b58de5eedc2a/why_does_my_heater_say_e1.pdf
    • http://xelatisil.rf.gd/perimetry_interpretation.pdf
    • https://uploads.strikinglycdn.com/files/fbbf1ca6-84ee-464c-bddd-4769af14feac/vubuxejekesuduwilobu.pdf
    • http://gafibis.epizy.com/street_fighter_2_full_movie.pdf
    • https://uploads.strikinglycdn.com/files/e87e9d77-5253-44ce-8cda-5175f4531c81/20804591818.pdf
    • https://uploads.strikinglycdn.com/files/0015dff6-da25-4f7a-ad22-50ff79391a04/92298900631.pdf
    • http://vogojitipam.epizy.com/free_alarm_clock_app_for_pc.pdf
    • http://zuzofigub.rf.gd/till_what_age_can_a_man_be_sexually_active_in_india.pdf
    • https://uploads.strikinglycdn.com/files/61fbd766-212d-4567-8945-62c281a9cca3/lg_g2_battery_connector_ways.pdf
    • http://zoletiwosi.rf.gd/regusijelisexoragupukid.pdf
    • https://uploads.strikinglycdn.com/files/7c28be6e-5918-425c-b503-8a53568a2de2/kinetico_premier_water_softener_cost.pdf
    • https://uploads.strikinglycdn.com/files/6e99d24b-be2f-411a-b5f0-e87f10072252/jumonogenekosatifif.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_off00010ade.bin
0900c8309ae512ea9045c57fede77e5b43b611ec68c9cfafb38ab99500385095		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADE 5400 bytes
font_01_sfnt_off00011d70.bin
2f5f648d2fb0fadbb1f39652ede78940dc3fe18bf1432da11d37895f2ddc52fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D70 12756 bytes

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