Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fac529acdafc473…

MALICIOUS

PDF

79.9 KB Created: 2021-03-14 03:16:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5334284886ee82a10d804b083fb4351a SHA-1: e7d279da95d385bb320d075cf342d9312d06608c SHA-256: 4fac529acdafc473215b28491fc6014dfe23aa53a747cb2283c06cf1a93f9658
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=the+trials+of+apollo+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460266/normal_5fdf9c5685535.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481675/normal_5fffdae517f30.pdfIn PDF document text
    • http://hermidkovo.info/shirt_template_roblox_wiki4vimb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_603c11b1807c6.pdfIn PDF document text
    • http://gallery-shop.site/pompeii_bastille_violin_sheet_musiclyxm2.pdfIn PDF document text
    • http://difodalutovirub.iblogger.org/kabowagogobebibef.pdfIn PDF document text
    • http://xrootunited.com/besosapimi36i43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_601990200f9dd.pdfIn PDF document text
    • http://tegogufe.22web.org/glencoe_geometry_textbook_answer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fea50346-ab34-4b67-843e-90a6383c4983.filesusr.com/ugd/bf678e_cb46f0aa57b6454a9b2d7ad87d20f74d.pdf?index=trueIn PDF document text
    • http://kisepupiregeseb.rf.gd/16419546978.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/lady_antebellum_song_never_alone.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_7de00bbb1cfb4ff98a1ece42269061ba.pdf?index=trueIn PDF document text
    • https://be8414c4-f2d5-40c6-b8a8-1a5561a1dac7.filesusr.com/ugd/a452ea_7c64e66d9b034ffa9155336f076b116a.pdf?index=trueIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_b027eb080cf2494bb242e12579035350.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/welebaduj.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_d0bdb03354e8444a8f0939eca81cdf1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/duwixukux.pdfIn PDF document text
    • https://4a1fbaa0-0e67-401b-a466-96699e2e5642.filesusr.com/ugd/9647bf_44a79e475ce74545877894154700f5b2.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_eb0b6e573a2a4a3d83fcab1786ddb8e3.pdf?index=trueIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_fa56e437e0f046a98db89a28e1ddae6e.pdf?index=trueIn PDF document text
    • http://dogurapib.rf.gd/35534137418.pdfIn PDF document text
    • http://tabijuxez.rf.gd/chemistry_notes_for_class_11.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 4760 bytes
SHA-256: dcbe1b6a9f9ff18d69aad332a8627f70094406b505de2883d13ac48e4a8260af
font_01_sfnt_off0000feef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEF 10796 bytes
SHA-256: 74df73d036bcb5e77705ed5efd0583b9bb5488811bbcf46322ae957a075fd04b
font_02_sfnt_off000123c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C4 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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