Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b83b4bdc7d2c91…

MALICIOUS

PDF

68.8 KB Created: 2020-12-21 05:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 095144228660c2fc04f738a264923c4d SHA-1: 2f44828ad18119951b0e838e466cb127cf2aa822 SHA-256: 33b83b4bdc7d2c91a2f96a1cb99b098c83e11abf049636400406107e95a98be8
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/strik?utm_term=html+code+play+pro+apkpure In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f88f33828923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5fcf9c3b8ded6.pdfIn PDF document text
    • https://kumusexowefas.weebly.com/uploads/1/3/2/7/132741352/dedd5d20e57d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5fb387b312cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_5fd82d9577f72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f89ad7ddccf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_5fdc4f5f338bc.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/0bc49057-5af1-439a-b748-4a7b8d452cb0/mesabakamis.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc042db8787e8798968ae67/t/5fc10353e6d49a06bbb5c3a6/1606484827495/my_favorite_things_worksheet_adults.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/first_solar_series_4_spec_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d973826d-4f91-4377-a604-c81877a32dfd/love_nikki_diamond_redeem_codes_2018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc826ac3cfda2dcf0aa550/t/5fdcf3585dcc214978bc6a70/1608315737228/lamborghini_new_song_full_hd_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149e47f5-9220-4b1d-bdf5-da72cd93bd96/tipos_de_problemas.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/cord_cutters_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d8b45a-8cd9-4c1c-ac2a-85271c93ea1b/jerixanirutigitu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD104 5168 bytes
SHA-256: bcf9d9f333e5948819cc3186511d0d5c0577ded358a5ef1614cd5c01c6532f65
font_01_sfnt_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 10472 bytes
SHA-256: 32f7abab22a08e12232d893223f3aabcbb506d75ed36f818d4f9c909bbaac7e4

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