Malicious PDF — malware analysis report

Static analysis result for SHA-256 706555ee2bb41e9b…

MALICIOUS

PDF

86.6 KB Created: 2021-03-28 12:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: da06b0f66fd46ad4e51a678c5b7e08ee SHA-1: 7990757c87af6754789e87afba846517d7bc0abc SHA-256: 706555ee2bb41e9ba2e1cf2cb67c827831fc68ff61223e61e2e48e9c090ae7f4
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'crophysi.ru', disguised as a driver download. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which are benign but likely serve to mask the malicious one. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=digi+002+drivers+for+logic+pro+x In PDF document text
    • https://tubadelemifevit.weebly.com/uploads/1/3/4/5/134509228/xulejodarevomot.pdfIn PDF document text
    • https://guretaximijogu.weebly.com/uploads/1/3/0/7/130739376/vileseputimaxal_figex.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/jamia9v/seasonal_key_leader_lululemon.pdfIn PDF document text
    • https://dazafilitekanib.weebly.com/uploads/1/3/5/9/135977429/2782875.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/33Hjdhf/9476172638.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/gavidufupeveredaka.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/wudobezaseb.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_b9c0b07b74d04cc5bda7a11a9fbdadf7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c2f69aa-5cee-4a9f-9d92-7b12fb3c9577/how_much_to_hire_a_carpet_cleaning_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbf005b-2e6e-4d4d-8092-a0c08384c900/what_is_the_power_dissipated_in_an_ac_circuit_in_which_voltage_and_current_are_given_by.pdfIn PDF document text
    • https://d17f4099-ecc1-42b1-9c73-51521793457c.filesusr.com/ugd/4a2613_31c18b5c4c8a478bac41751e9d8337e3.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_4ad499ced9214ea3bb1cd89cedcf3585.pdf?index=trueIn PDF document text
    • https://9e0ebcba-7e04-41ac-afc6-cfc574163c15.filesusr.com/ugd/6725b5_86b334848a834badad5c473ad77ce2cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb053922-ba46-470c-bf6e-9ba5d3e45376/international_journal_of_medical_education_impact_factor_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/jakukekuvunikefigapeb.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/guzorezo.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/world_art_history_timeline.pdfIn PDF document text
    • https://b5d51143-f34a-4a4f-9265-6917490cb775.filesusr.com/ugd/9f69bd_9908b348f28c45b0bc0f4dc5c385652a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/frank_sinatra_have_yourself_a_merry_little_christmas_in_movies.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/wejul.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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 5516 bytes
SHA-256: d80c390b7bcf0563688be7e935d3dd6b5c7640f8cb918c7b12ac069e6854e2e9
font_01_sfnt_off0001101a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101A 11404 bytes
SHA-256: e0ac7ea94b11ee10ae33be1a215c4667ccaa082c962c7113f864632d245c61db
font_02_sfnt_off00013701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13701 16288 bytes
SHA-256: 3c72c9b267e4b55aec6f519c44c1823f7844e879e3b635f55d29d08d4c858c73