Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc506ac62293dd80…

MALICIOUS

PDF

126.2 KB Created: 2021-01-21 21:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4ec94d5d7921f09f69a30376392a6e9a SHA-1: d36947df846208e83d4ba1690d9800d3a062fe89 SHA-256: fc506ac62293dd8007043bac0d1113cc5dc962336ddc500ae3a9c9efeb1a47dd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious link farm or phishing attempt. ClamAV detection and ML classification further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and numerous external URLs indicate an attempt to redirect users to potentially harmful content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=bray+curtis+distance+beta+diversity PDF link annotation
    • https://cdn.sqhk.co/fifapupifig/UIm2Ue3/fist_of_the_north_star_ps4_game_length.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_6000b72b40861.pdfIn PDF document text
    • http://tesopinafap.22web.org/restaurant_website_template_html_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ff93f7c1a0bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392474/normal_5ff310898592e.pdfIn PDF document text
    • https://cdn.sqhk.co/tupuxinekowa/iiiifgh/kisowojuvugewugubatufepuw.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/UsuibjT/32728262306.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383136/normal_6007d150740e6.pdfIn PDF document text
    • https://gozataxuwo.weebly.com/uploads/1/3/0/7/130740141/kerolaf_kozunu.pdfIn PDF document text
    • https://lukidamovepuk.weebly.com/uploads/1/3/1/4/131437538/2007126.pdfIn PDF document text
    • https://site-1218722.mozfiles.com/files/1218722/48802920220.pdfIn PDF document text
    • https://jovimujokuva.weebly.com/uploads/1/3/2/6/132695493/b1484b0f098aef.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/vifusupegiza/round_of_applause_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/xogoviwedologofezo.pdfIn PDF document text
    • http://xepepofebaxuvib.epizy.com/getz_pharma_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/epidemiologia_clnica_fletcher_gratis.pdfIn PDF document text
    • http://guxozuzemonixe.epizy.com/general_dynamics_information_technology_address.pdfIn PDF document text
    • http://jokiperone.epizy.com/xalix.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001bac7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BAC7 27416 bytes
SHA-256: 4574202dbb3dea5c985ca12715360b928c7f9b79d0841add6907aa14ce083196
font_00_sfnt_off00017f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F69 5252 bytes
SHA-256: 6b4ada9b062fc70ddd051518729cda20ee0e6c3353c9bf695d6121f48ce20e16
font_01_sfnt_off0001915d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1915D 12060 bytes
SHA-256: 3233a9e73b6666c9626d55b28ceab4355ef1333a4dfc24f205c01e7b00114ad3

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