Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a6cb050fc8c19d…

MALICIOUS

PDF

71.3 KB Created: 2021-02-11 16:03:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: aa0dd6df4abfb9426b90f79e6905ea8b SHA-1: ebf429796676738d1de1547d6ee69f10a7dda3a9 SHA-256: 70a6cb050fc8c19d4c21af382eec7f9dd1ae702dd772ff440d8ed39f8a8c44f7
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=olympus+esg-400+brochure PDF link annotation
    • http://limavirom.22web.org/54372083221.pdfIn PDF document text
    • http://boldly-grow.com/hcc_affirmation_of_residency_form_onlinej8pos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476766/normal_5fe26e14d4c97.pdfIn PDF document text
    • https://jodajapiguzok.weebly.com/uploads/1/3/2/7/132710756/vukil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388174/normal_5ff853dd40ed0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_601e19bc925ad.pdfIn PDF document text
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/susunagezi_zasitopewojan_nenuturizotom_zonugavut.pdfIn PDF document text
    • http://dusosax.66ghz.com/48493215553.pdfIn PDF document text
    • https://pofitokibifezaf.weebly.com/uploads/1/3/5/3/135394855/1326950.pdfIn PDF document text
    • http://teragoronowaki.iblogger.org/marezuz.pdfIn PDF document text
    • http://tazaled.22web.org/82333495280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_601ae1528e6fb.pdfIn PDF document text
    • https://toziraza.weebly.com/uploads/1/3/4/5/134506396/bc599918ecc7789.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://javasuk.epizy.com/zatupaginewakiwi.pdfIn PDF document text
    • http://kixixiwibatogit.epizy.com/plane_racing_games_android.pdfIn PDF document text
    • http://loworalaxarugo.rf.gd/14784821462.pdfIn PDF document text
    • http://bokakemipik.epizy.com/cholo_movie_song.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_off0000d999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD999 5668 bytes
SHA-256: 34920550f3fa2b349bf3a8e33075da85b10ab2258085cf405e5281a5401b3a4d
font_01_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 10452 bytes
SHA-256: 8f114e5df8be163831c0bd67ad875869228cd5bd15f6bd6bcbf0186fd9a69801

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