Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a27172d424c518…

MALICIOUS

PDF

75.1 KB Created: 2021-02-24 04:08:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1485822d9588c71c16a9245b61b994d7 SHA-1: 7893d746ce49b2de14c8bb3cefe32af68cc23c55 SHA-256: e9a27172d424c5187d161858c979a0a7c438f57127087d86dba2f768a0c5011c
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

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 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.
  • 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://maypoin.ru/123?utm_term=which+is+better+roomba+960+or+980 PDF link annotation
    • http://lamovingcompany.com/read_file_in_python_3.74utrw.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/hczigij/asteroid_impact_on_earth_in_future.pdfIn PDF document text
    • https://cdn.sqhk.co/badexejos/ghjjc5T/kuposerugiwav.pdfIn PDF document text
    • http://baltika-trans.ru/soundbot_sb240_manualscoz8.pdfIn PDF document text
    • http://the-english-temple.com/xedofo8ykko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_6026e1e55da05.pdfIn PDF document text
    • https://cdn.sqhk.co/buwisotubu/ig8Sp7k/snowman_storytime_rhymes.pdfIn PDF document text
    • https://kigukudisan.weebly.com/uploads/1/3/5/3/135321724/1041441.pdfIn PDF document text
    • https://buwenesuxunuga.weebly.com/uploads/1/3/4/8/134883777/4643696.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484093/normal_6004ae883e76f.pdfIn PDF document text
    • http://tuguxanofa.iblogger.org/72437287285.pdfIn PDF document text
    • https://zupelewelasilag.weebly.com/uploads/1/3/4/5/134594614/kekuxulowavof_rusanen.pdfIn PDF document text
    • http://byt-upak.ru/lonipifipupojuxonosiduvrcswr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5fe385215cac1.pdfIn PDF document text
    • https://cdn.sqhk.co/wopiwozaso/iv0gi6c/46216618918.pdfIn PDF document text
    • http://avto-document.site/67823734302jxjrq.pdfIn PDF document text
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/51a7dae2653609.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zewipurorafe.epizy.com/hernias_de_pared_abdominal_pediatria.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 5804 bytes
SHA-256: fde4acf93b3be727e0c02580afe53a625a967a6d6f53b26d9fa5611d3db31edf
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 2140 bytes
SHA-256: fa98316bad0ee393e4244be63b1d230beb4724cf855be96ad4f2c87a5b302ae2
font_02_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 10852 bytes
SHA-256: d1b1ebc496b1b53706713b55b9c0e5e88cc3739cacd0a60ca99ddae07eaf4b81

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