Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fa771ec6bb881e…

MALICIOUS

PDF

78.5 KB Created: 2021-06-10 15:39:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fbdd429d48a2e9196ba99d7ddc7e8ee SHA-1: c4e4e95766296362a7e799ef28fc0574db16b05b SHA-256: 38fa771ec6bb881e3d54347bfe7922b9a9d05da87601c5371ed97680dfd1422a
156 Risk Score

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 phishing or trojan threat. It contains a large number of external links, many pointing to PDF files hosted on Weebly, suggesting a link farm or SEO manipulation tactic. The primary URL, 'https://nomylo.ru/pbw?utm_term=counter+strike+offline+windows+10', appears to be a lure for downloading software. No scripts were extracted, but the PDF structure and extensive link farm are strong indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nomylo.ru/pbw?utm_term=counter+strike+offline+windows+10
    • https://ruritetij.weebly.com/uploads/1/3/4/7/134704214/4387225.pdf
    • https://julupeti.weebly.com/uploads/1/3/4/6/134608278/deful_totisisojitinef_fezokamosiw.pdf
    • https://loxekezipoga.weebly.com/uploads/1/3/4/6/134678149/fdf7d37.pdf
    • https://jedunaxalow.weebly.com/uploads/1/3/1/6/131606453/tubesar_biwiwixatafarik_pinarame.pdf
    • https://fajuvupo.weebly.com/uploads/1/3/5/3/135310445/a1b44825d8f85.pdf
    • https://bivogovaxi.weebly.com/uploads/1/3/4/3/134320375/7b52f.pdf
    • https://laboxowoxom.weebly.com/uploads/1/3/5/4/135400847/luduvabasijazejopud.pdf
    • https://kibipevanisimak.weebly.com/uploads/1/3/4/7/134770361/687381.pdf
    • https://static.s123-cdn-static.com/uploads/4369930/normal_5fdf7837937a3.pdf
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/cf6058a2d49.pdf
    • https://tokoposejod.weebly.com/uploads/1/3/1/3/131380771/1774026.pdf
    • https://guwamiludakubor.weebly.com/uploads/1/3/1/4/131453222/5896779.pdf
    • https://wakazezoloke.weebly.com/uploads/1/3/3/9/133999839/a06ed7b0f594702.pdf
    • https://cdn-cms.f-static.net/uploads/4418570/normal_60c0aa6b35f42.pdf
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/668c6dc86cc.pdf
    • https://vunidiripoga.weebly.com/uploads/1/3/1/4/131453449/8597355.pdf
    • https://famigupew.weebly.com/uploads/1/3/5/3/135302829/63ac1587.pdf
    • https://bomosaxume.weebly.com/uploads/1/3/4/8/134892214/susupi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/00235776-d95e-48c7-8c43-03a5756d2ec0/81837016577.pdf
    • https://uploads.strikinglycdn.com/files/2d62206e-7e3b-46bd-86e1-f60bcb4f852b/39110547820.pdf
    • https://uploads.strikinglycdn.com/files/08d70a9b-c0bf-4daa-ba12-e171fb38d1a2/bogudovekud.pdf
    • https://uploads.strikinglycdn.com/files/22ebe2ce-846c-4ae1-8d88-8475df04ce16/40079707356.pdf
    • https://uploads.strikinglycdn.com/files/073ae9a4-8de2-45c4-99a5-6db9707f1b1a/how_to_open_a_sentry_safe_with_key_but_no_combination.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29b.bin
8c6ea6019b7bfadb9dd6a0b3675e7b6d86505b1066c9c6640005ad131ee6dc86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF29B 4948 bytes
font_01_sfnt_off00010399.bin
9b6f78a344a26a5f2de83f3ba7c9d39dd3716c4d53c6e8080204264e555e846d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 12004 bytes

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