Malicious PDF — malware analysis report

Static analysis result for SHA-256 99de96fa6d1fb7e0…

MALICIOUS

PDF

90.8 KB Created: 2021-05-20 22:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6dd0ce3a745d584660f95c5dcfd0c442 SHA-1: 50fbedac96c63338c608c77d8bb7d4ade8f38c48 SHA-256: 99de96fa6d1fb7e06fb6a194975f2ee6da94cbbca4637dbbe4c9b239d06169f4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://jacksth.ru/strik?utm_term=what+does+a+dragonfly+represent+spiritually PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5fd7d829d91d3.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/luteto_davuxudarus_setuledo_fabubujibada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_603c7fb9024c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_602b5c51f1e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_5fe94ba7582ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479916/normal_5fc5a3d7abbf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_60346c74089d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403260/normal_5fd108c3407f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_6065c33e12e76.pdfIn PDF document text
    • https://vipofobusaxipol.weebly.com/uploads/1/3/4/2/134234766/8906169.pdfIn PDF document text
    • https://gogijufiwadika.weebly.com/uploads/1/3/4/5/134581681/zimuwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466673/normal_60445bfac8e61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_603bddf31ed10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468838/normal_6010b69de777a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454040/normal_5ff21db672afc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_60387e556cbfd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418747/normal_5fcf84a4c79e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382406/normal_5fe7ab1f35187.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/fukezavazuj/45011977907.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/fact_sheet_sa_pagsulat_ng_balitang_isports.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/can_spells_crit_dnd.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/naruto_shippuden_beta_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/speed_vpn_uptodown.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_off00012571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12571 5420 bytes
SHA-256: b6d0d4693ed6ab77a9b4cd07fbe1618d8e1ba1d74345773b86977e808b5acb76
font_01_sfnt_off000137f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 10508 bytes
SHA-256: db024481e2557fb2932f32a6f85bd1fb1eb81f78b826f66df20a2d404413a6f8

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