Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b03eb3c396e88ff…

MALICIOUS

PDF

73.7 KB Created: 2020-12-17 01:54:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4f54357289d20740f32bf711611e7f59 SHA-1: 2ba57a57c39563b37d050234c3b83fde958f7070 SHA-256: 4b03eb3c396e88ffb29fdd8e3044090aef200e131229d936ce02999a2c1a5bb6
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, with a critical heuristic identifying it as a PDF link farm. The primary malicious activity appears to be directing users to external URLs, such as 'https://traffset.ru/wb?keyword=idsa%20guidelines%20spinal%20epidural%20abscess' and 'https://bulireta.weebly.com/uploads/1/3/4/7/134727307/pitidukomijoji.pdf', likely for phishing or to distribute further malware.

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
  • 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://traffset.ru/wb?keyword=idsa%20guidelines%20spinal%20epidural%20abscess PDF link annotation
    • https://bulireta.weebly.com/uploads/1/3/4/7/134727307/pitidukomijoji.pdfIn PDF document text
    • https://jojimixumomural.weebly.com/uploads/1/3/4/4/134438106/beferofegu.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/f776ecf8-05c6-4aa0-b334-f8da21fad341/35478023685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79238d3f-0b66-42aa-a7ed-885f86527706/miller_syncrowave_250_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f20c442-c29e-44de-baae-125638ea052c/43728034821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/882a6b40-52d0-47a6-8cdb-a75a91faeb8a/63915446804.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/uc_browser_java_jio.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/birthday_invitation_card_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/ages_and_stages_of_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26de5c13-3130-4424-81ab-e874abb4e810/vetuwurularofabuwinezaze.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0b5bec30a162e0c519083/t/5fc7a1c1a038a451bcf3cb13/1606918593066/dozaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2e70ba-f767-402a-8a4c-ac541253d37c/lidukuledufax.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/navijixososezedazuxuruni.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/dirt_bike_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d317fa33-11d3-47fe-8c03-2256c5fdf3ac/41130010164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19928ddf-0a43-4194-ac01-a2ea5094d0ce/81084495714.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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 5316 bytes
SHA-256: 10b0ef9463682bcb327ea38ec467ec4aabb8d7d030c2c4ef41ec83f810a4d596
font_01_sfnt_off0000f20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20B 12268 bytes
SHA-256: ca9abf05595f44d5feb8793c33417fe6a9a8e896295b8e17a1effd458409fc16

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