Malicious PDF — malware analysis report

Static analysis result for SHA-256 f862165050c96419…

MALICIOUS

PDF

83.1 KB Created: 2021-05-22 15:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6479be9745496a18ba0a27fee6c52880 SHA-1: 29b2d3b29430d36e04b2a67103106dd14607d989 SHA-256: f862165050c96419a46bbe2a7f25bf90605e140e7b1653a47a6f35d9ee83dcce
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 prominent URL, 'https://maypoin.ru/strik?utm_term=salesforce+admin+certification+dumps', suggests a lure related to certification dumps. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=salesforce+admin+certification+dumps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478670/normal_6039a69f683a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425484/normal_5fc71e1071305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_60541ae887cae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_6038ee6c3a07f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_5fd97a9be89dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419451/normal_5fe686a481b52.pdfIn PDF document text
    • https://lirisosu.weebly.com/uploads/1/3/1/3/131384099/6906c41ef.pdfIn PDF document text
    • https://judorobizud.weebly.com/uploads/1/3/4/4/134455398/nasezo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_5fd0b49da330c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_603106344ef49.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/776ab361-620d-4ce8-8499-d2165d608c41/50390485133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b6fc83-c47a-4232-8bf2-986eba6a1d27/wafelobotatazip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4cf2a3-6232-45fa-82e6-687cfa33917c/toro_724_snowblower_belt_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/useful_synonyms_for_ielts_band_9.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/colchester_sixth_form_staff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e166d27-f382-4495-9ebe-0cf5f714fc1a/zedikuvemipobefivazofab.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/how_to_fix_a_samsung_galaxy_s6_edge_that_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/cantilever_beam_deflection_with_uniform_load.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8c97e1-b66d-488e-bc81-b6dc1b8708f4/is_bbg_effective.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 5404 bytes
SHA-256: 411721ec827f164f1fec6353f1e7c20e66b6c3e2bfb117260afbac2379b74120
font_01_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 11284 bytes
SHA-256: d47b8f6ed009d6fe036d734f716463692612625adb6af979464f9f543365f53d

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