Malicious PDF — malware analysis report

Static analysis result for SHA-256 61edc4c5ba77f50b…

MALICIOUS

PDF

82.0 KB Created: 2021-03-21 05:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c6ac7634320d21a100454c4b273d2e84 SHA-1: 4920fa20c74d973345d332f6f925e41b6b05bf78 SHA-256: 61edc4c5ba77f50b33fa09b5b4dc17a8ffabe84b7a03085d62ed01aa2045dd3d
134 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the heuristic for a 'download button' suggest the document is designed to trick the user into clicking a link that leads to a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=how+to+make+an+adjustable+knot+for+string+bracelets PDF link annotation
    • http://usblighter24.site/book_report_templates_for_grade_4b71yq.pdfIn PDF document text
    • https://mabedokuk.weebly.com/uploads/1/3/4/5/134582143/2c573f12e2.pdfIn PDF document text
    • https://cdn.sqhk.co/vopunokapire/WcshiLh/iron_bottom_sound_shipwrecks.pdfIn PDF document text
    • https://jirilerimu.weebly.com/uploads/1/3/5/9/135967849/024cc7.pdfIn PDF document text
    • https://xetiwokew.weebly.com/uploads/1/3/4/7/134741649/891032.pdfIn PDF document text
    • http://tk-time.site/democracy_dictatorship_monarchy_worksheeto7mif.pdfIn PDF document text
    • https://buparemekixa.weebly.com/uploads/1/3/0/7/130739227/6066107.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/tp-link_n750_default_ip.pdfIn PDF document text
    • https://koxewujinam.weebly.com/uploads/1/3/3/9/133986689/1188267.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/uidhaL7/24673795542.pdfIn PDF document text
    • http://prod-fruit.space/8480709284v9b1u.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/zivodipalodemo.pdfIn PDF document text
    • http://wide-do.top/arcanaloth_monster_manualemha2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wazipegemezen.atwebpages.com/alcatel_u3_user_manual.pdfIn PDF document text
    • http://vegubom.atwebpages.com/a_level_chemistry_paper_5_notes.pdfIn PDF document text
    • http://sezulezaba.rf.gd/xuluxeku.pdfIn PDF document text
    • http://litopuputorer.rf.gd/movisek.pdfIn PDF document text
    • http://tesumavifan.epizy.com/which_flowers_in_the_attic_movie_is_better.pdfIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/what_is_zone_3_training.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 5672 bytes
SHA-256: b8e5d8e98f30a9904404066027eddf101849ae8e62ac85826d3825f7a46f2462
font_01_sfnt_off0000fc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4D 11340 bytes
SHA-256: b63c160c2bdfe768f6cefc83a5e1e86bad58aeb737dc1a1c834a3289d2881867
font_02_sfnt_off00012306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 16452 bytes
SHA-256: 7e7d69d03ec86ad11f23a21eb19b6c6f12b5b3ccefd016256265842ff5b14917

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