Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c30771e8b59f70…

MALICIOUS

PDF

97.6 KB Created: 2021-03-15 19:12:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: de36a5bbd645e6a691687ff817cdaf3c SHA-1: b304f4e556da84dc864d19d25d587ff08f082e88 SHA-256: 05c30771e8b59f70f1efb7f1595e65971e2bce6553d6d8db87d757d29215d5ed
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, indicating a link farm or redirector strategy. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further support its malicious nature. The document body is heavily obfuscated, but the heuristics indicate a phishing or malware distribution attempt through external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://vilenefex.ru/strik?utm_term=vizio+e550i-b2+remote+app PDF link annotation
    • http://zugasanuko.getenjoyment.net/fuwisawifegaje.pdfIn PDF document text
    • http://lodixewovufosa.iblogger.org/zoxowodejofuba.pdfIn PDF document text
    • http://sugalomiwuto.getenjoyment.net/60656984861.pdfIn PDF document text
    • http://sotikipi.22web.org/xajafipozovon.pdfIn PDF document text
    • http://zaranes.getenjoyment.net/xuwenufivelugejojuxobu.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/word_meaning_in_urdu_audacity.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_b92ce9364d30424e854d3ed14ec26f2f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/21700747489.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/roniki.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/samazafajajopiraxubavamab.pdfIn PDF document text
    • http://wewefaxekedafoz.epizy.com/21699494047.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/conectores_en_espaol_ejercicios.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/sakerirago.pdfIn PDF document text
    • http://xigesema.epizy.com/anita_s_breakfast_burritos_nutritional_information.pdfIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_e096d3d540334623afc20616c5da3916.pdf?index=trueIn PDF document text
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_28bc1eae610c493e8c460b6247a529fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/2146243399.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/14435327276.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/zutot.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/picsart_photo_studio_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/96341051356.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_079326ec62144b9b8aabfd9de921e8bc.pdf?index=trueIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_51ffc9302db34a37b41cc5bb9faa3d27.pdf?index=trueIn 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
    • 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_off0001271a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271A 5340 bytes
SHA-256: 2e96937f4af900c0c727fb817b7e70d56dd56ecfd97cbf4540aaf7434d7020a9
font_01_sfnt_off00013942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13942 12600 bytes
SHA-256: 14c6f9151f4b7b26d7d157f23548b3c86e8f272d5769f2d95ec80dbbfda272b6
font_02_sfnt_off000163bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BF 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848