Malicious PDF — malware analysis report

Static analysis result for SHA-256 1038c1e00b458a7d…

MALICIOUS

PDF

76.3 KB Created: 2021-05-24 19:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6ae1a388662a05e540c059ec1b6007ff SHA-1: b5b789c486493544ae400cedb46abb077f5798ad SHA-256: 1038c1e00b458a7d6691cc33f527c1724371c419f5a7b5c6a42ffc1471779342
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to drive traffic. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a phishing or malicious redirection scheme.

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.
  • 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.
  • 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://soxebez.ru/strik?utm_term=kindergarten+reading+comprehension+worksheets+pdf+free PDF link annotation
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/5272516.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461773/normal_606a336dbd642.pdfIn PDF document text
    • https://pikivazok.weebly.com/uploads/1/3/0/8/130873779/kuvozarumafuzuvad.pdfIn PDF document text
    • https://xidamosu.weebly.com/uploads/1/3/4/7/134707329/sugiregebat.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/8999223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_603a2caf92c2e.pdfIn PDF document text
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/xesiwufabivig.pdfIn PDF document text
    • https://dufamapa.weebly.com/uploads/1/3/4/3/134399252/6142649.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/552f4a4f-ffa0-4856-a4d0-1b92c14de5a4/rosepet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e610bc93-3b89-4b58-a607-e40cdd335cd5/acido_sulfuroso_formula_quimica.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/xisowerometerepowolul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f643bc3e-89f9-4cb4-8bd5-195e8e57f820/10184919072.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c983df4-9666-4932-93a1-8db5bdfd300e/tixigivazarodevoz.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/what_causes_a_riding_lawn_mower_not_to_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8e9c70-0622-4740-a42b-a454e5d2cb89/barney_stinson_bro_code_quotes.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_off0000ea05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 5664 bytes
SHA-256: 7c1a815bf571d0cf3cb956a4cdff6677af9aa45530397a33d302108890eceecf
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 10944 bytes
SHA-256: 6f24e3ca253dcf085b385b1f2b7addc1761671592e108aee7fbee6e3955b797e

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