Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f76b922a9e597c…

MALICIOUS

PDF

82.4 KB Created: 2020-12-27 17:44:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3e040b1f12f1a8872cc9fcf508d2eb69 SHA-1: 960be8cf613c2b2943e3542d261c710cf79a7ce5 SHA-256: 84f76b922a9e597c7a7c3a1efbbe0908ce8933e268ac3f0a9bd39a392b3f2ada
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The primary external link points to a URL that appears to be part of an SEO spam campaign. 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 content, aligning with phishing or SEO spam tactics. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=blackberry+bold+9700+whatsapp PDF link annotation
    • https://benixufo.weebly.com/uploads/1/3/4/6/134660079/gakos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413117/normal_5fd7711b7c78c.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/8853440.pdfIn PDF document text
    • http://www.opentle.orgIn 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/d84551bf-347a-4135-8dcc-6c67effbbc9a/taclane_kg-175d_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/pezojixuzixinu.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/9580016334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82039565-f861-485a-9f74-161d59d8d6aa/24105152294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58aef19e-fa33-4fcb-bf5b-ee7483acff4b/pokemon_fire_red_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/dixavewol.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/hashflare_calculator_spreadsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/kali_linux_wifi_hack_commands.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/damifebowakimokavafulafo.pdfIn PDF document text
    • https://s3.amazonaws.com/venunamazozuzo/suburajevefupusiz.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f025.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF025 13540 bytes
SHA-256: eaddd464b0793f53f86a1b9297c18670bc58599502b092c63251e3d86205fdd3
font_00_sfnt_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 5984 bytes
SHA-256: 5594869d6a600a576cb63f99eef4d4bb7c92f4cd6768e589e56c2cf58078af97
font_02_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 11780 bytes
SHA-256: d0972cd84eb9709f70fedb4950ec98d58de563401491f86e8beae05069bdbad5

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