Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dc16cc47f62e67…

MALICIOUS

PDF

77.6 KB Created: 2021-01-22 11:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2ddb16852cdc6bf07fffb0cda6b1db83 SHA-1: e9bf5e6f098cca50b4fc8fdaf38b9b5da6a47651 SHA-256: 49dc16cc47f62e671991e383f23eca32fd96df35c827a6535b91c9e21d4d3e8c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on various domains and cloud storage services, suggesting a link farm or distribution mechanism. The document body, though heavily obfuscated, indicates a theme related to "penny stocks" and the authoring application suggests it was generated programmatically, likely to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=the+complete+penny+stock+course PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5fec3cab9910c.pdfIn PDF document text
    • https://zexajupa.weebly.com/uploads/1/3/4/6/134692079/715c6a3bb37d3.pdfIn PDF document text
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/8091989.pdfIn PDF document text
    • https://site-1171615.mozfiles.com/files/1171615/40312078633.pdfIn PDF document text
    • https://mesikanuxiruk.weebly.com/uploads/1/3/1/6/131636832/b435e55f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384825/normal_5feb22bf4029e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_5fdb53b09f4a3.pdfIn PDF document text
    • https://jonumupemusegiw.weebly.com/uploads/1/3/0/8/130874210/pegifur.pdfIn PDF document text
    • https://roxogarafuxor.weebly.com/uploads/1/3/1/1/131164132/5046645.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/tikoweravisixu/54666796674.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/98838463690.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/xojibufuxavivesel.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/81383679006.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/house_of_cards_season_1_episode_guide.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_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 5076 bytes
SHA-256: 1fc7ffdd64e32691f87c05be44a60ee2554fad76cc56d43ff0a5a52546e4bf6d
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 10660 bytes
SHA-256: ebd0f27d55c04dfd632827286e4f2a5a89939ad114a01a7961ea9e8bef9a563c

Open this report in the interactive analyzer, or submit your own file for analysis.