Malicious PDF — malware analysis report

Static analysis result for SHA-256 66810d2d1d6e29b9…

MALICIOUS

PDF

67.1 KB Created: 2021-02-28 03:39:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e49f292bb44387ceea964fa4a4fa3435 SHA-1: b226adb507cbe97a5b0a9ff1eb553d1057997539 SHA-256: 66810d2d1d6e29b9b4c7e2b7b6b42f2247b581c2f5637e18c54a0a2fd977a5a0
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many of which point to a domain associated with SEO redirectors and phishing lures. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically flags an image lure leading to a redirector. The ClamAV detection and ML classifier further confirm its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/wix?keyword=manual+merck+de+veterinaria PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453115/normal_5fc800780b604.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/xawiwajigafeju-tixexezi-zolepakis-bolofatigagike.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/zizalubes.pdfIn PDF document text
    • https://ruvutitijo.weebly.com/uploads/1/3/4/8/134883381/3491555.pdfIn PDF document text
    • https://refedekejevejat.weebly.com/uploads/1/3/4/3/134312363/75827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456165/normal_603aca537750f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_5fe64a487cd31.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/631917.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/41027123154.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/manufacturer_website_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/application_form_format_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/saboraw.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/13244039759.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/app_store_games_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/rikumovekanavawutexedupa.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/68655667387.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/bhumi_bangla_song.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8F 5036 bytes
SHA-256: 429a7e0c17687f9fea868d1ec7890132b1465becc6d6e1c2a7d46e070bb415b8
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 9636 bytes
SHA-256: 8a80b27e2f0adfef7aa5e2ab784735d3e6c1fc843564047b20b9cbd9b98c02a2

Open this report in the interactive analyzer, or submit your own file for analysis.