Malicious PDF — malware analysis report

Static analysis result for SHA-256 231ba4bd29e8e7ac…

MALICIOUS

PDF

78.7 KB Created: 2021-03-01 14:35:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6b043353a73e76135a6cc64aaa9f9273 SHA-1: a260052afeeb8c764c743f64f3cd727d45a1ccd4 SHA-256: 231ba4bd29e8e7acc0ce06ffa9a2a4826d5d001234c6474138e2ed5d981b1f00
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 point to other PDFs, suggesting a link farm designed to manipulate search engine results. One of the primary links leads to a URL that appears to be part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://soxebez.ru/award?keyword=rowenta+compact+steamer+reviews PDF link annotation
    • https://nokajavu.weebly.com/uploads/1/3/0/9/130969653/162198.pdfIn PDF document text
    • https://pidolanapeg.weebly.com/uploads/1/3/0/8/130813957/jakove.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/d7aaece9b9ee.pdfIn PDF document text
    • http://dhl-order.info/70049703085r10rc.pdfIn PDF document text
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/molazoxa_wegufipituta_sifoter_zefozajurenin.pdfIn PDF document text
    • http://zalavsky.ru/ahqaq_ul_haq_book_urdum8zi4.pdfIn PDF document text
    • http://dmgameplan.com/740499698776lma6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/employee_information_form_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/5040897834.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/tetarezagum.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/bsc_online_registration_form_gujarat_university.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/18_korean_drama_series.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/best_football_games_apps_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/flash_card_template.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_off0000f8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AE 5208 bytes
SHA-256: ec827e5dbc7350f98cb39b4bca0785c0de51f543fea50cd7825f5894c4e352ab
font_01_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 10428 bytes
SHA-256: bdea0c41083a028a11af3a12278d50274592474c8c10bbe4d4d07557021f207d

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