Malicious PDF — malware analysis report

Static analysis result for SHA-256 105b5acc79682985…

MALICIOUS

PDF

74.4 KB Created: 2021-03-11 01:38:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e853f82a695814687098c1a9d313370c SHA-1: cee3364c9058237bb952c4dede2121698f9c175e SHA-256: 105b5acc79682985ebcc2ef2c62f99ca3a9633a3e6810559c4db336318fa7491
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a significant number of external links pointing to disposable domains, characteristic of a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful sites.

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
  • 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://midufefew.ru/wix?keyword=which+direction+is+the+wind+blowing+tomorrow PDF link annotation
    • http://idealslimitaly-official.site/is_wall_street_mojo_legitz914p.pdfIn PDF document text
    • http://satofaxa.iblogger.org/file_a_police_report_chicago_online.pdfIn PDF document text
    • http://mavurelaro.22web.org/60570923953.pdfIn PDF document text
    • https://renijavodis.weebly.com/uploads/1/3/4/7/134709946/pubizupojo.pdfIn PDF document text
    • http://sipivide.iblogger.org/dakewil.pdfIn PDF document text
    • https://judezasisurag.weebly.com/uploads/1/3/4/4/134498900/kinatunafopojujud.pdfIn PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/9fe30197af9.pdfIn PDF document text
    • http://smirno.life/what_is_the_best_stock_market_to_buyx4jc5.pdfIn PDF document text
    • https://bevotiwi.weebly.com/uploads/1/3/1/4/131437753/bevokutotetorig.pdfIn PDF document text
    • https://kowadesilokawu.weebly.com/uploads/1/3/4/2/134265693/0f633e95b55.pdfIn PDF document text
    • https://kerozusokenizil.weebly.com/uploads/1/3/1/3/131383247/77102af0a629c31.pdfIn PDF document text
    • https://tefovaxosu.weebly.com/uploads/1/3/1/1/131163863/veribudodi-wapeti.pdfIn PDF document text
    • http://dixajadabaw.66ghz.com/fishing_report_cape_hatteras_nc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://silapopo.epizy.com/xebikaf.pdfIn PDF document text
    • http://bituxezemas.epizy.com/97667629458.pdfIn PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_ffc8f757459e4efc90195318d3ac7a07.pdf?index=trueIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_2a66e8e26f604b2f83f23c4db0d8ce8e.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_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 5388 bytes
SHA-256: d23b42f551bf87bca5f9fdbf7b4ed18bc720cbc80155f9a92349c3983153e11a
font_01_sfnt_off0000f8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A4 10456 bytes
SHA-256: f661e7d1430f796da3cf572d4e67f8b73a369e24817c98d74123c135d03861e5

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