Malicious PDF — malware analysis report

Static analysis result for SHA-256 683492e4c689a5b3…

MALICIOUS

PDF

86.1 KB Created: 2021-02-28 16:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 0038ff805e0575415f3f9bd45770a3d1 SHA-1: ff0515a37fd1104a014123039557259369a77319 SHA-256: 683492e4c689a5b3f0c9d08f31a68fd57aa55adbee70224e87ad61ac510eb417
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary URL, 'https://bologen.ru/123?utm_term=why+does+logic+system+overload', suggests a potential phishing or scam lure. No scripts were extracted, but the presence of numerous external links points towards a content-driven attack, likely involving redirection to malicious websites.

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
  • 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://bologen.ru/123?utm_term=why+does+logic+system+overload PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485591/normal_6027f1a4a4f16.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413235/normal_5ff68edf9ba93.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/hihbzEv/36572067183.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/9613215.pdfIn PDF document text
    • https://kapuwibipu.weebly.com/uploads/1/3/0/9/130969563/pujukuzikuxux-dolifetoj-gadajaxofededan.pdfIn PDF document text
    • https://rasazumeg.weebly.com/uploads/1/3/1/4/131454762/gipetewusev-telev-buveziz-wepevububo.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/jRFjdgh/34981427392.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/WgWii2A/temple_final_endless_run_3_play_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fce8f347b9d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5ff2bdc24dfca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/50151479834.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/how_to_charge_a_samsung_hmx-f90.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/soteretalebovuwiw.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/72882994753.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001055f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055F 5212 bytes
SHA-256: fc08de58263f21434da6736b9e18ce77281844f4322857c028b9ec05e3fbb6b7
font_01_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 11200 bytes
SHA-256: e1d0dbed4986f72a3c8fa5717be48a54fb19913a9062f24a6777186fd2e8f172
font_02_sfnt_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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