Malicious PDF — malware analysis report

Static analysis result for SHA-256 7516a395bde4587c…

MALICIOUS

PDF

78.9 KB Created: 2021-03-16 15:57:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ba4e6750784cca67050181cf2ca9156 SHA-1: 984fb904b4fc70de9ef779cdbce2b65af135bbd2 SHA-256: 7516a395bde4587c79c6646e57f7669079f5647cef0305bbab5d6e9b772d82b1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9993

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 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.
  • 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://lozipotod.ru/strik?utm_term=design+patterns+in+javascript+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476432/normal_6025e46c2b334.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/hdhiid8/my_dolphin_show_7_poki.pdfIn PDF document text
    • https://cdn.sqhk.co/xizubutagen/gfTvsMq/38458872790.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426945/normal_5ffbddc8a67d4.pdfIn PDF document text
    • http://housefashion.ru/50821372230e8s6i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fca668a29808.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378381/normal_5ffcab105d8e6.pdfIn PDF document text
    • http://imkl-checker.com/41902823383o0ywt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383321/normal_6025c8dc5cc2f.pdfIn PDF document text
    • https://cdn.sqhk.co/futevanu/bhehgje/replika_my_ai_friend_app_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377120/normal_5ff104542dd3c.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/hfIifji/sniper_shooter_3d_best_shooting_game_fps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498404/normal_5fc9d9c93dab9.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/dihjdhe/hoppy_frog_2_scuba.pdfIn PDF document text
    • http://bupetud.xyz/lincoln_210_mp_duty_cycley52iu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366627/normal_5ffc8e972a2b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486201/normal_604cd332223ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_600c611f94cc9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449421/normal_6002638696dcd.pdfIn PDF document text
    • http://originalhallyu.com/70569477891m2ewy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_ef500071d8dc4e7283703270a8aaca8b.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_0334999fc61c4462aad7a88a22740bc9.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_c05591db2b34455bbf84f5e4a3b2e131.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_b7621ee0b4344d8699a610226703bb33.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_off0000f434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF434 5428 bytes
SHA-256: 08b9fddbdc34067bd3863e495ce6c45505bfd2db63299d88fe0fd583e1efbcdf
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 11000 bytes
SHA-256: b57c6fa10c6fb5e0e6777dcffe7d522a69f1512a19c28477c26eec8a580108a3

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