Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90b8005c2657d82…

MALICIOUS

PDF

78.8 KB Created: 2021-03-04 11:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 22ed6b77e6fe498e1f7f892200012883 SHA-1: 560a84fba4ea59bccc8ea68b8be620e8248a6f39 SHA-256: d90b8005c2657d82a91a38b6d6141660035997d7c412fc92a240767ea97c8e36
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector and a link farm. The embedded URLs point to known malicious infrastructure, indicating an attempt to lead users to harmful sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=inferno+dante+pdf+italiano In PDF document text
    • http://italdom.fun/raging_bull_big_and_tall_size_guidetgjmk.pdfIn PDF document text
    • http://busibear.com/zaxavixewotokamatisurozivhouh2.pdfIn PDF document text
    • http://feyakast.online/how_to_start_daphnia_culturejya3q.pdfIn PDF document text
    • http://kyhni.site/damus6bdet.pdfIn PDF document text
    • http://itclick.pro/zavozuvijadilulobddl9b.pdfIn PDF document text
    • http://rapisakaxo.66ghz.com/15379861625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426571/normal_5ffa3f884b2ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368781/normal_6034ff1153672.pdfIn PDF document text
    • http://penaxuwilamufo.iblogger.org/speaker_of_test_failed_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426966/normal_6035363d0af8e.pdfIn PDF document text
    • http://toppiksnack.xyz/best_book_for_java_beginners_to_advancedt35ik.pdfIn PDF document text
    • http://insuranceautousa.com/105752978892v25x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479224/normal_5fe7b970d51de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424328/normal_601a776e8beb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486775/normal_600581a0596ee.pdfIn PDF document text
    • http://ufenmac.com/idle_empire_hack_apk26h6o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zonuzaxesinok.rf.gd/free_printable_comic_book_templates.pdfIn PDF document text
    • http://kosejoviwo.epizy.com/39090219563.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_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 4796 bytes
SHA-256: 507e78595e6cbd36da578778dcc6b2e31770aa458e6073f95b525045c302e0ab
font_01_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 10148 bytes
SHA-256: 188a8be8b9417681ede7c8346ac6fbda7ab0f5550a50a766c98144f18da6a082

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