Malicious PDF — malware analysis report

Static analysis result for SHA-256 1536357bf66a4429…

MALICIOUS

PDF

71.9 KB Created: 2020-11-22 18:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e7ad357beffd2330fe4609ee5b499b9f SHA-1: b14736da6f55339791be44f2f555abbf2211d967 SHA-256: 1536357bf66a4429d0574e7cb2c5d422a263a3e7e949de1f8b892481d376aab0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs point to various PDF files, likely serving as lures or further stages of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/123?utm_term=bikini+bottom+dihybrid+crosses+answer+key PDF link annotation
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/zotit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461497/normal_5fb33b26a4a44.pdfIn PDF document text
    • https://nikotegonekis.weebly.com/uploads/1/3/4/6/134628666/gejanaxipofimufo.pdfIn PDF document text
    • https://gutirupivib.weebly.com/uploads/1/3/4/7/134768574/d54101c77fc0e.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/c6d7735.pdfIn PDF document text
    • https://mogugadikawes.weebly.com/uploads/1/3/4/0/134096191/tenuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5f8af6312f5b5.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/6651589.pdfIn PDF document text
    • https://rabebazenapaju.weebly.com/uploads/1/3/4/7/134771608/73f9333363563e5.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/e6338439-1337-48e2-8537-1e96b01120c1/92900793910.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/67066402635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2fa332-4e91-4772-9f4d-b47405615f2f/right_at_your_door_full_movie.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_off0000c435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC435 5592 bytes
SHA-256: 7103ce9386fee41503a6a7b8f08ced325eef4ee12bae521dbddd2cf452029335
font_01_sfnt_off0000d722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD722 11060 bytes
SHA-256: c571473e8050d345aee460b1b637430da842ab9f16d28808e68d648d31f89e72
font_02_sfnt_off0000fd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3C 16084 bytes
SHA-256: 62a91fb32920f6e8cc04f0b1e834142448e73e4a31e16512d2a7fd751ba0d286

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