Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b574109030668a…

MALICIOUS

PDF

83.2 KB Created: 2021-02-15 20:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bd7529e76a5cdc3d03dea06d033e832a SHA-1: d27f298e87d704c62ed563c746cb5bf284f577cc SHA-256: e8b574109030668a82f75d70b6af2ab2099667041d5d546faa05cd4a941d2680
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it is a PDF phishing or link farm document. It contains a large number of external URLs, suggesting an attempt to redirect users to malicious sites or to generate SEO traffic. No scripts were extracted, but the presence of numerous links points towards a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=polaroid+tablet+8+inch+price PDF link annotation
    • http://baby-slings.ru/how_much_is_my_strawman_account_worthg057r.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/inGa4ij/marketing_strategies_for_the_business-_to-_business_market.pdfIn PDF document text
    • http://everydayy.fun/multiplication_and_division_worksheets_grade_35o8c5.pdfIn PDF document text
    • https://parixaxagutu.weebly.com/uploads/1/3/4/4/134465429/126436.pdfIn PDF document text
    • https://funobijego.weebly.com/uploads/1/3/1/6/131636789/4670602.pdfIn PDF document text
    • http://allerlo.xyz/97517284440jva93.pdfIn PDF document text
    • https://cdn.sqhk.co/sijiposago/icStWij/video_player_for_windows_8._1_32_bit.pdfIn PDF document text
    • https://zalogarigi.weebly.com/uploads/1/3/2/6/132695681/dd02ce99f.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/zabejuvijolu/pekoxarejiwibedatup.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/gigabyte_x299_aorus_gaming_7_pro_manual.pdfIn PDF document text
    • http://gidepajujida.rf.gd/interior_design_case_study.pdfIn PDF document text
    • http://donamekadozuxuk.rf.gd/94634960129.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/windows_10_version_1803_issues.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/1465442302.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/acrobat_reader_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/greater_honeyguide_and_honey_badger.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/android_app_store_logo_png.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_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 5316 bytes
SHA-256: 0a84679f88b83d6144cca35decde9068eda1e709530ff77f0c1d7c60e8c2716b
font_01_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 11096 bytes
SHA-256: 6e21c6e9d4417973284630e2a1c9acefbdc17a94e12e49f1c342c242da974855

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