Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebc438cc51db3da…

MALICIOUS

PDF

46.7 KB Created: 2020-11-04 17:04:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fecc8d600f0b5c7bf1aefc19b3361447 SHA-1: 90fd3d574abd2c2de84ca499c38f2a1b0f3ee379 SHA-256: 5ebc438cc51db3da6ec20d4e6752f4db56cc8f91c65fedf155cac903bf46f34f
174 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/strik?keyword=electron+energy+and+light+pogil+answers+key In PDF document text
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/gavod.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/fesixukorupu.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/barefekesu.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/dovulavavo/90007776576.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/navy_enlisted_ranks_ww2.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/93791341557.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/wepowepuvosufotubu.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/79633557667.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/59382978371.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/developing_world_research_topics.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/eleanor_oliphant_is_completely_fine_book_synopsis.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_off00007448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7448 5552 bytes
SHA-256: 0476fb50cb973fc6abe838a96687e577dc3e78ddeadcf144f3e17070f2343a71
font_01_sfnt_off0000873a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873A 11364 bytes
SHA-256: 92be130234b75baf8e80cca27ed990747cd5ae27790be41c955717ccca8d2461

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