Malicious PDF — malware analysis report

Static analysis result for SHA-256 71581a5739a02a1f…

MALICIOUS

PDF

81.6 KB Created: 2021-03-28 17:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c471d760e7e25bf363929e7cd69718f2 SHA-1: caddb45a67b00824b63045057058b24bcf046f52 SHA-256: 71581a5739a02a1f7c6e31fba9a82681f1b7a029a3ffc95faefa7141515d050a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and other benign-looking PDFs, but also includes a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of the extracted URLs, 'https://resalured.ru/strik?utm_term=mbti+cognitive+functions+examples', is flagged as suspicious and likely serves as a lure to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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://resalured.ru/strik?utm_term=mbti+cognitive+functions+examples PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370996/normal_5ffa2935f303b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_6035930e97466.pdfIn PDF document text
    • https://fejuzewe.weebly.com/uploads/1/3/4/8/134883228/2053998.pdfIn PDF document text
    • https://bupebilonozopi.weebly.com/uploads/1/3/4/8/134861312/fubitikafiwuzekabawo.pdfIn PDF document text
    • http://bigtittybella.com/mamiya_rb67_lens_adapter_for_nikon_dslrzw9ov.pdfIn PDF document text
    • https://jibigevemur.weebly.com/uploads/1/3/0/8/130873945/5830943.pdfIn PDF document text
    • http://devgame.design/platform_number_16_ndlsr9ap3.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://s3.amazonaws.com/pomaxa/free_acapella_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/dd_beyond_character_sheet_print.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/delojasozefedewiw.pdfIn PDF document text
    • http://kagiwabiluwotel.epizy.com/adodb_dll_64_bit.pdfIn PDF document text
    • http://nuvavevuk.rf.gd/don_juan_mexican_restaurant_arcadia_wi.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/is_chinese_grammar_hard.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/26459812686.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/33528208620.pdfIn PDF document text
    • http://ledaxefamadore.epizy.com/template_for_making_a_word_search_puzzle.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/rewumamokuwimogiputemogu.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/joker_speech_murray_franklin.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_off0000f3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A1 5396 bytes
SHA-256: 81078eddaf6bf70241da19eb8a7831507780304b563181081de1124d55ae2789
font_01_sfnt_off00010607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10607 10696 bytes
SHA-256: b53980ed4b88a53381d11e59c33cc94f83bff3a0c3b97cba4feb6a6b50215b92
font_02_sfnt_off00012a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A93 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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