Malicious PDF — malware analysis report

Static analysis result for SHA-256 111ecf04a8a139b2…

MALICIOUS

PDF

69.0 KB Created: 2020-12-08 00:24:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1a2d01619580218a1947d665fda8f1a7 SHA-1: ba8dfa66fb02d1e56089d7be3a2a8b8596830e91 SHA-256: 111ecf04a8a139b29bf8464d46d7d542e40bf0dbac11019baa5faa3604e97fde
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical heuristic indicates it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Newton's second law problems worksheet answers'. The presence of numerous external links and the redirector link strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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.
  • 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/123?utm_term=newton%2527s+second+law+problems+worksheet+answers In PDF document text
    • https://kiseridebajesa.weebly.com/uploads/1/3/1/4/131408791/logunavav_beraleburovege.pdfIn PDF document text
    • https://zexunipubu.weebly.com/uploads/1/3/4/8/134877105/jikalu.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/vamodapipasinipiton.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374198/normal_5fa36a64038c1.pdfIn PDF document text
    • https://diwopoko.weebly.com/uploads/1/3/4/5/134597367/xataguvagoxufiw.pdfIn PDF document text
    • https://gesivakegozuk.weebly.com/uploads/1/3/4/7/134768451/fenusuzipibum.pdfIn PDF document text
    • https://jemajodelevo.weebly.com/uploads/1/3/4/3/134394711/861293.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/somamere/xidikipilasiduwokedofije.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/24037419520.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27e0b2cf09257bd761280/t/5fc76ceba3696915e22557e6/1606905068382/animal_origami_free_origami_app_origami_folding_shelves.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
    • 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_off0000b8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F5 5612 bytes
SHA-256: d445b2909c5353bbff2c76c7cf05a795f00e3f07454df3a58a9a8ad942164a2e
font_01_sfnt_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 10056 bytes
SHA-256: 3c8b3485fb4b8cc60032f4aaeee37a30bd9feb7d34a8259879bbe0a07311f482
font_02_sfnt_off0000ee91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16404 bytes
SHA-256: 6064819fb476b77586fd068298112614520455ce38406d19cd412a64c2d23fb8

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