Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d37386d6572df94…

MALICIOUS

PDF

83.8 KB Created: 2021-05-25 03:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d0b536bed989ca58fca8f10e783b5f9b SHA-1: f07f97662195f8ccb8520948d69222d48def38f5 SHA-256: 2d37386d6572df94b0650657effd6eb6f507120f6607237caac1ccaae670c04e
156 Risk Score

Malware Insights

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

This PDF document contains numerous external links, a common tactic for SEO poisoning or phishing. The primary URL, https://leonvi.ru/strik?utm_term=energia+cinetica+y+trabajo+ejercicios+resueltos, suggests a lure related to physics exercises. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

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
  • 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://leonvi.ru/strik?utm_term=energia+cinetica+y+trabajo+ejercicios+resueltos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459470/normal_60239d789469c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415770/normal_6012129201aef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387565/normal_5fe3218630fdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_6035864e42f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469836/normal_5fd133e882946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456399/normal_6051be47df52f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368979/normal_5fcd271a67692.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/wasufesewogova.pdfIn PDF document text
    • https://kasasifu.weebly.com/uploads/1/3/4/6/134697732/1543366.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6bed3e4-c324-45b8-87ca-1f135eaad1cd/xizugirajazesarijup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d508b01-5b5a-47d9-babd-af515bf84b7f/princeton_review_mcat.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/frase_auguri_compleanno_formali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8de67c8-3d96-423c-8703-cf8e6aa41f97/49430280913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8b26d99-cdd7-406d-8096-3809e70620c7/69127968613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a574431a-cfaa-47fb-bc8b-c92170a5be62/how_to_view_private_instagram_profile_no_survey.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/can_i_get_tomtom_maps_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a35395b-58eb-4584-92ad-d5adfe0814de/dosuwefisitejuge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce278bd2-bb56-4f46-b03c-723430daf971/67705261152.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/300_common_spanish_words.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/os_x_catalina_slow.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_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 5240 bytes
SHA-256: 8e69d0bc2beedf28fb27526fd0979d9922d1e578259311fc968cf7720146e59b
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 12468 bytes
SHA-256: dcbc31d6f8f0d5b25132c5572a44362154c60eb5badfd5374e6d5ccff43867e3
font_02_sfnt_off00012cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB2 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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