Malicious PDF — malware analysis report

Static analysis result for SHA-256 753bd5e48245b262…

MALICIOUS

PDF

111.6 KB Created: 2020-11-26 18:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dbfe8dc2f01b4c901b0d1c5127a2d2fe SHA-1: e403665eb5da8e487491858b8cf1a638bbfb72de SHA-256: 753bd5e48245b2622edf453d2a24c396c7d336d8819e77c29e955fae9c981e00
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains multiple links to redirector domains, including a critical finding of a PDF link farm pointing to known malicious infrastructure. The primary redirector URL is https://cctraff.ru/strik?utm_term=giant+river+otter, which is used in conjunction with a lure related to "Giant river otter". The presence of numerous external PDF links suggests an attempt to generate traffic or distribute further malicious content, likely for phishing or scam purposes. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=giant+river+otter In PDF document text
    • https://minufufigazibur.weebly.com/uploads/1/3/4/5/134528603/afa7687e.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/fokusabalez.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/xalitawiwom.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/1660a45b3e6d.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/ac294d2f8cc6430.pdfIn PDF document text
    • https://jaxazinozusepir.weebly.com/uploads/1/3/4/2/134235406/fewusa_nukat_tajidimasaxa.pdfIn PDF document text
    • https://lonerunit.weebly.com/uploads/1/3/4/0/134017922/2896602.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/gonavo/wedususobevamoki.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/constitutional_amendments_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e547c2-ed7a-4499-8911-895971c27470/35586967402.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/12719860667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f5c401-600b-4636-88f0-acefd8416c7c/paint_tool_sai_2_full_version_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/dirt_bike_unblocked_66.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17767 4560 bytes
SHA-256: 4d342f699569350c7cb39801693156a47ba7340667f4e874fedf315606f018c4
font_01_sfnt_off00018701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18701 13396 bytes
SHA-256: 3b6f232f28e6c2126a2a14b85e0847810e612fd0e685db05271902e950e9fe32

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