Malicious PDF — malware analysis report

Static analysis result for SHA-256 a763cd13f37662f0…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 18:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4202274deb43417fb52672c69cb118cc SHA-1: 9829d54e1cf2555f9da0afa5db8f5aa50d857fb2 SHA-256: a763cd13f37662f0bd6897b56a6ef8b252b4668bbe2432c98003e3100bc63206
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this being a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=roasted+sweet+potatoes+and+onions+with+balsamic PDF link annotation
    • http://ngoinvest.com/uploads/ckfinder/files/tejigewozasukusoroduge.pdfIn PDF document text
    • http://kdekdyjak.cz/data/51384851558.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/bakoluzamajuzuw.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/ruzugatuvaxobojoparetani.pdfIn PDF document text
    • https://argumentua.com/i/file/bedexowoduwewul.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/49480122573.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/megelatilalelom.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s6goa49dmqnf6ktd2kjh4aubgl/34113218798.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/88503927661.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/93673859641.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lugotojunugigivakemizu.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/6676327576.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/puduvifefilositofubewiz.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/resexavinotaxufefajul.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/wajidedevuniver.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/bebibupolava.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/posefotisewafutuvufititax.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/811248883.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/pikupexike.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/bevutirenudirisa.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-01/55c34f5552000279f272fffe11b2370f.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/30216693235.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/77788819272.pdfIn PDF document text
    • http://xn----8sbkebltdkywd.xn--p1ai/ckfinder/userfiles/files/mujizezurojuvazitofubu.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_off0000b2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CF 15584 bytes
SHA-256: 7953948e6dc70d12c9ac25ce7bf42a2ee3fbc766daf95c6a301e7c5b7c7e349b
font_01_sfnt_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF287 10952 bytes
SHA-256: 406e3290e5c94a6d5bb99649320e0f562e54d2a4fecb3a618cce364c86afaf63

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