Malicious PDF — malware analysis report

Static analysis result for SHA-256 079a5aa7c4b48c11…

MALICIOUS

PDF

83.5 KB Created: 2021-05-20 07:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: b82a5fd8bfda132f4fb1b4f394be0ddb SHA-1: 9616b470f7cd9b7f16e2b37742e4634b8817260d SHA-256: 079a5aa7c4b48c1115813657261de840e5a4f0bc1f690887f04ff3cfb03ca9b6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many of which point to potentially malicious domains, including the primary IOC: https://bologen.ru/strik?utm_term=ir+spectroscopy+principle+and+instrumentation+pdf. The document body, though heavily obfuscated, suggests a lure related to scientific instrumentation, likely to trick users into visiting the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://bologen.ru/strik?utm_term=ir+spectroscopy+principle+and+instrumentation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366623/normal_60372a213d9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_600f8f2bba123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388156/normal_600ef1fa73bb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409616/normal_60591ccfd3259.pdfIn PDF document text
    • https://jutijodofolumel.weebly.com/uploads/1/3/4/0/134012985/c742270f0332f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451231/normal_5fd611b97c86d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_6035541f4051e.pdfIn PDF document text
    • https://vufufibujirefe.weebly.com/uploads/1/3/4/3/134355905/bawakumeti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485699/normal_5fd5f9a83be6f.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/3bc804ad-d3eb-4687-89ef-37a15523bdac/hoover_windtunnel_pet_vacuum_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/como_curar_una_amigdalitis_de_forma_natural.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/lewulegerejiduvexebavixik.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/eukaryotic_cell_structure_and_function_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/palgrave_study_skills_critical_thinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa77e864-58d8-4ff2-917b-7d6e74bfb3ac/44843270563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42c44ff1-d332-4d4a-821a-c050a590d34b/instagram_real_vip_followers_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/34773285088.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A4 5220 bytes
SHA-256: beba028c2722358e94a2dea709553816170abf1027bba2f634d697c52f570457
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 10516 bytes
SHA-256: d55ae9227d2aa22361bd41b579e98f6dddb8910131c1f757ac5155e520af53fa
font_02_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953
font_03_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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