Malicious PDF — malware analysis report

Static analysis result for SHA-256 708789598e03adea…

MALICIOUS

PDF

86.7 KB Created: 2021-09-12 09:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b0f6a73012909a547c09eac766a6c59 SHA-1: 97e68384618f0ad0b399ccc0fbfd3d60632d551d SHA-256: 708789598e03adea1eab20db2e54eefb51015404eeb20bdb3216c55bddb19369
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of UTM parameters in some URLs indicates an attempt to track clicks or obfuscate the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://erodiertechnik-wenzel.de/userfiles/file/lifijazetitewadoponiworo.pdf In PDF document text
    • http://studiodrago.eu/userfiles/files/xovunitoladibovasubuvi.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/foxoxunogobizavi.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210908201905.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/zodomekirunag.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/90900964187.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613575dfecdc4---winikew.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/33554061993.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/siwafuvuvuluxaxitariruz.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/kutunobaxotelurojukigog.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/zosemuf.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/sogefasebemiwoniwinojagoz.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/85607711516.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/12594296749.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/zisajuroxapegopibela.pdfIn PDF document text
    • http://contua.org/userfiles/file/kisewivijopevelagedaxa.pdfIn PDF document text
    • https://laser123.com/geektic/files/90753451210.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/ruvobefokuxa.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/wolejimugilegerimake.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/87031147199.pdfIn PDF document text
    • https://nasikampung.info/contents/files/fenutivixegix.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/64517046137.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/tubogezapos.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/5791282094.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/lagix.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/kupowugatoronaduram.pdfIn PDF document text
    • http://kme-kme.cz/files/file/85616535096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=us+constitution+and+amendments+pdfPDF link annotation
    • 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_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 18204 bytes
SHA-256: 41282ff1e0ef5f52155e590a60375c86378a155c70ad21b5bee33e118f5e47eb
font_02_sfnt_off0001343f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343F 10744 bytes
SHA-256: 5ee751d61de229588b6f9668f46cd1f0854d742ef2fb7a56f2e4171bdf7dfecc