Malicious PDF — malware analysis report

Static analysis result for SHA-256 847dde83cc98c008…

MALICIOUS

PDF

61.9 KB Created: 2020-12-20 06:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 84c8672edd31c47b1d6fbd1557747927 SHA-1: 55f9e8125c80705c451ab3527049ed7b80bc745a SHA-256: 847dde83cc98c0080d80a56a743164c3f5890a6e2e7db238130c653529107745
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The primary URL points to a domain associated with SEO spam. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users to malicious or spam-related content, potentially for phishing or to generate ad revenue. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/aws?utm_term=day+and+night+worksheet+middle+school PDF link annotation
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/9085281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f86f9cae2c17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_5fda9774569bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380068/normal_5fde768c886e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414696/normal_5fa17733b1f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f8c992e74907.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc4d8d416f6d44b07d7d45f/t/5fd6848dacac596b0cc01860/1607894158539/52379215026.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f5b088c99b6d37a76c18/t/5fc15822145a8629dce308f0/1606506530745/gun_bluing_services_michigan.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfd308239b0722912b0841/t/5fc0f0a73570fb44d124ff44/1606480039762/wapok.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f4078787e879896c419e/t/5fc84e4d970db930d9bc689e/1606962766050/vampires_1998_full_movie_free_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11b742e34347c70454783/t/5fc4f8319b1ed0353878b70e/1606744113828/tiny_toon_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/blessed_be_your_name.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fde7a4bff074777c9848638/t/5fdeb321fb7de13a64609cdf/1608430369727/donorobididolaxibar.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_off0000b561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB561 5612 bytes
SHA-256: 5fd6073880daed62760d64065020501c665424c12b466be25f3750a1e6ec47d4
font_01_sfnt_off0000c872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 10084 bytes
SHA-256: 5a8de5c2db935d132cea5edbbdfa6d922a629d5365d44139692685a0bd3f3e9d

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