Malicious PDF — malware analysis report

Static analysis result for SHA-256 b758a5e154a0bae3…

MALICIOUS

PDF

74.2 KB Created: 2021-03-22 23:14:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 244c476d8c6c2e34693e44e554c4f1b1 SHA-1: 7608e2776ca76da153c2b1c0080938d7b7705e0b SHA-256: b758a5e154a0bae328c52824de11f2a3c82d1138c55ccc3ac5a480aeac28575f
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including critical detections for malicious redirector links and a link farm. The document contains numerous embedded URLs, suggesting an attempt to lure users to external malicious sites. While no scripts were directly extracted, the nature of the link farm and redirector heuristics strongly indicates a phishing or scam campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=cuales+son+los+factores+bioticos+y+abioticos+pdf In PDF document text
    • http://suzamakulamuj.mypressonline.com/how_to_find_height_of_cylinder_given_volume_and_radius.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/juzodizusuna.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/64958647737.pdfIn PDF document text
    • https://nogonosexenepe.weebly.com/uploads/1/3/4/6/134674491/murepiworabu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_50dc7e99655945cba5548f0af089e89b.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_23b021f58f3249b38589c5d63764c453.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/blade_runner_1997_game.pdfIn PDF document text
    • http://liruselewaviba.rf.gd/69418213181.pdfIn PDF document text
    • http://faluzaxubip.epizy.com/69089078476.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/85699384976.pdfIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_6ae0ca67747e4d6e81f3ee8c044092f1.pdf?index=trueIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/50_states_abbreviation.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/jandy_aquapure_error_code_lo.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_ba3eec271ec74ebc9cd2178b4e5b204c.pdf?index=trueIn PDF document text
    • https://457cefd1-268f-49c0-9ca4-ced5ac281e6b.filesusr.com/ugd/983758_f5d2aeadf1434de483bcc88b232caa79.pdf?index=trueIn PDF document text
    • http://dupavumomupu.epizy.com/namakam_chamakam_telugu_download.pdfIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_437e20f5f39b49688a4e7f2f1b937e7d.pdf?index=trueIn 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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 5296 bytes
SHA-256: bca093de4fe9159e7e326c4da49a5eefb869ab3187fc3b1e5600fbe0b5efd571
font_01_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 11028 bytes
SHA-256: 73c3e9b36d06ea16e1c1a89bcbf1a5b089c0e29109dabb1415634c854242a98e

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