Malicious PDF — malware analysis report

Static analysis result for SHA-256 f891e8cfa5012236…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 08:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38af592c65edc4aa98995b3ef658428d SHA-1: b21fea0f7392d45f2f504bfb1efb802245ed03a9 SHA-256: f891e8cfa5012236fefbfe1e15bc601fdde412c30b7efd11f40e32d1c3f96352
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with one pointing directly to an IP address, indicating a malicious intent to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution scheme. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://andana.us/files/files/xebalolovunineku.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404067ec8a2---gofigozepizikixa.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/punupabagaledoxedoweduped.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34596606997.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/7249362188.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/96161255224.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/12715581638.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/44411745202.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/sabuwifulerivafefaled.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/gubudovipi.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/lisukevo.pdfIn PDF document text
    • https://hsse.cl/files/61079838233.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/dasuwuzifox.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/1279455043.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/14854425008.pdfIn PDF document text
    • https://quizai.com/uploads/files/sobijawexinoxupumuvok.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/72572674118.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/munatalularazuwewovu.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/numubopidagedaxuruvuver.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/97933475135.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/todesapuwewekepit.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/66251354660.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/dodabipujesapatola.pdfPDF link annotation
    • http://cellesekorea.com/ckupload/files/30739252164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cities+skylines+best+map+for+damPDF 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_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 11036 bytes
SHA-256: f1bb3e533bb62144f65b63f35e20a6c978259b1a77bd855c20ba95119b445d11
font_01_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 19084 bytes
SHA-256: 7db65baaafed2770b108d17d77ac0b2452f65190826077c49e13960b260f8711
font_02_sfnt_off00012e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1