Malicious PDF — malware analysis report

Static analysis result for SHA-256 703d2ec3905f0bb5…

MALICIOUS

PDF

85.5 KB Created: 2021-09-12 07:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0868c35540ccfe169a66d27c0f4293f6 SHA-1: 42ed596deaf2f65b7257d26a92ca4dc8baf7824b SHA-256: 703d2ec3905f0bb51bcdb7d31f97b491e31d2f0332a7cd68245df510f4e9be2e
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains or redirectors, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=the+bell+jar+pdf+free+download PDF link annotation
    • https://valeaflorilor.ro/img/uploads/file/dukepigesamabogejeg.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/86376490618.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/38824708152.pdfIn PDF document text
    • https://petikdaun.com/contents/files/joduximuxelozarugi.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/vokuz.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec729bacf2---pizidovirifajuwik.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/zanulebudupo.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/mimozogilik.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/talitubesujetobimo.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/muwoxe.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/89652120382.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/73901627055.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/ratagofodaz.pdfIn PDF document text
    • http://airsoft1.ro/files/file/xaxurawokixobamumonodep.pdfIn PDF document text
    • https://iwistw.com/upload/files/71953011427.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/pepomeludesejijuxowo.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/12241444811.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/22274300660.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/jitil.pdfIn PDF document text
    • http://sparkpro.lv/content/file/notarulugavololiwibatis.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/88535741987.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/90999993352.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/kudepabuzajudu.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/44125595657.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE911 18184 bytes
SHA-256: 9e3ea8e8bd47fd00ab5ce0b5fc6f039145a1bdfd159ae65f0bce44d500a8f2f1
font_01_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001307c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307C 10556 bytes
SHA-256: 2559d10430fab36b6666c62f933915a5424e093431e509e906a6a46b6b26fa6e

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