Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a54cef4768774b…

MALICIOUS

PDF

80.1 KB Created: 2021-05-24 19:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8414aeb53f9bc5a53208836f2954d99b SHA-1: b209b86152252400d0e2ae06b0ca98ae4aca06d4 SHA-256: 94a54cef4768774b5f64edbc5e0882bce3d1c145bc8275f6b33dc4e791d6ea62
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating it is designed to host a large number of links. The primary malicious URL identified is https://yafferge.ru/strik. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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/strik?utm_term=writing+variable+equations+from+word+problems+worksheet In PDF document text
    • https://ginixagizelak.weebly.com/uploads/1/3/5/3/135349131/f3e013665.pdfIn PDF document text
    • https://nokavapeselodes.weebly.com/uploads/1/3/4/6/134638024/lifojide-zesugadog-forovomodi.pdfIn PDF document text
    • https://ruwotepileta.weebly.com/uploads/1/3/4/4/134493455/911152.pdfIn PDF document text
    • https://sinitilelimokiz.weebly.com/uploads/1/3/4/3/134348988/909e06.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/zasufujujik.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/86976f519.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/wiwuvobilo.pdfIn PDF document text
    • https://nimizinimaji.weebly.com/uploads/1/3/4/7/134703428/3464432.pdfIn PDF document text
    • https://vororesefuvemux.weebly.com/uploads/1/3/0/8/130813496/6778060.pdfIn PDF document text
    • https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/xanana-gapaduvilopif-nesukukig.pdfIn PDF document text
    • https://zufunukilaje.weebly.com/uploads/1/3/4/8/134888690/6582660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/lufogipovinisifasu.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/chapter_2_cumulative_review_algebra_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/association_in_java.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/siemens_hearing_aid_models.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/rumi_bookstore_fremont_ca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5910154e-c3b3-46cb-a6e4-a6ea6fdf19d5/pedari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0192841f-9e48-4949-a4b4-aa9698c2cf1a/what_rivers_flow_south_to_north_in_the_united_states.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/android_phone_login_to_google_account.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/zedez.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/air_minimal_keynote_template_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce72d9aa-7071-4d97-912f-593b81ede22a/sosuriper.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_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 5948 bytes
SHA-256: 99d742521cba1d83acfa9e87f33a41796674b3ca513312084c9d9ea36e26b0a6
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 12196 bytes
SHA-256: 3212bd4ce13aeadfc0833d4e8bcd84fee7c9a4ced127d913d01a25c8074cf732

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