Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8653acb3de4541…

MALICIOUS

PDF

71.4 KB Created: 2021-03-23 13:35:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 00d27a9930fc88231b5978c31aa551a2 SHA-1: 9c3159c7122e20773a15edbd5e0181b986428043 SHA-256: 4d8653acb3de454150d262b8f6fd6ed6d5f7c0507d23257b2c93d94fba37910b
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a ClickFix paste-and-run lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/award?keyword=download+abbyy+pdf+to+word+converter PDF link annotation
    • https://cdn.sqhk.co/gadewekunel/wzaCqhc/cinemark_entertainment_stock.pdfIn PDF document text
    • https://delimilakemasuj.weebly.com/uploads/1/3/4/4/134400920/1b7e217e.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/ejcsneY/homescapes_hack_level_80.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/bhfgdXT/clash_royale_hack_gems_2020.pdfIn PDF document text
    • https://webakutukulufu.weebly.com/uploads/1/3/2/6/132683024/496898.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/ccna_discovery_1.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/wibekifoselajefofuzuwo.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/cbe0714587.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/bimugudakogadozesime.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/jcPijjc/aplikasi_video_editor_android_tanpa_watermark.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/3175446.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/kuxegu/xevowol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0a33c85-b0f1-461f-8a1d-7e577c0bc391/is_amana_a_good_washer_brand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d01cf3a-c8e2-49e8-92f2-abcb5df2e1b1/22771276548.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/1801953513.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25a4d56-1f4b-4438-a2f7-9a359654f3b5/65800086519.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/zoxugufinogejorikas.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/vitamin_b12.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/15597461187.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/jet_jj-6_review.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_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 5364 bytes
SHA-256: 5da61dc249eb80656aa336d53bcc4bb47d65ce7ab9819494ed06ce5fa92d050b
font_01_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 10668 bytes
SHA-256: 3740c871258348974b5a315f6d74c3b76a5563347fbfc41b36b4a1fd7f114fc8

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