Malicious PDF — malware analysis report

Static analysis result for SHA-256 02b8edb1116ac7f0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 17:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 77ef373edcafff0020b98f2ca19faa18 SHA-1: 497485618cec468451c68cf8daf146cc1c6b2947 SHA-256: 02b8edb1116ac7f0f5c06cd8ed84ee7e82bd6f4647614a6c0e841630f4b3ce00
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 of which are dynamically generated, indicating a link farm or redirection scheme. ClamAV and ML classifiers identified this as a phishing or malicious trojan. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to lead users to malicious sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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=what+is+the+most+expensive+spiderman+comic+book PDF link annotation
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/439366.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/4523521.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/ihphmgj/8840890740.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/hhjhbhd/ball_drop_2020_live_pacific_time.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/3dc92e69-2114-4fa2-b2fc-1ddaa815e872/44808480087.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/picsart_apk_for_pc_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/027cb156-0f1f-4276-b108-38bfc6ba38a1/english_vocabulary_words_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38907dad-5eba-4772-8191-b27f248d2b9f/57793447334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ac4e316-5917-47fd-b09d-41accb470f52/dodefivewumapuxawoxuno.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/customer_profile_template_for_sales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15fe1fda-fd94-4aab-b957-77de17eb4424/47215973682.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/bookworm_deluxe_per_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/words_ending_in_ed_and_ing_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67453faa-14c4-465e-b485-08e669436dfa/lojaz.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_7c125eeff8cc410e8b289adf901074ce.pdf?index=trueIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_d0c36c61f57443a3aeeb84230d3e3490.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c98df6f-50ea-468d-87de-4529ce687b03/inverse_trig_functions_integral_formula.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_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 5628 bytes
SHA-256: fed966d187a76f61460be32fa12a2d6a93aa85351d2f132e1a83a2a274f951e1
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 10640 bytes
SHA-256: 22660b643266a8f91645663ca941c7c69356c855dd41be3ec3a35c0b53dcb94f

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