Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39a2d125d95cf6f…

MALICIOUS

PDF

82.7 KB Created: 2021-03-08 20:28:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10446de6bfc326b06de06e504b0669b1 SHA-1: ca47450a17a26728218543fae6220a27d2e74d84 SHA-256: f39a2d125d95cf6f4829bbe3085d04b8b1bbdfe27ea5374a4240cc8ce85dd0a9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO link farms to manipulate search engine rankings or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing or trojan threat. The embedded URLs suggest the primary goal is to redirect users to potentially harmful content or download further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/award?keyword=applied+mathematics+modelling+pdf PDF link annotation
    • https://nopolojeg.weebly.com/uploads/1/3/5/3/135349815/eba06d9.pdfIn PDF document text
    • http://wejewirivi.iblogger.org/25843312022.pdfIn PDF document text
    • http://samaraexpo.com/jukuzitisatuzx8dfp.pdfIn PDF document text
    • http://13millions.store/kaantasan_ng_pang-_uri_worksheet_grade_4u4w38.pdfIn PDF document text
    • http://pawelemofub.iblogger.org/statistics_for_business_decision_making_and_analysis_download.pdfIn PDF document text
    • https://munuteme.weebly.com/uploads/1/3/4/8/134862418/xosisufasuxujowi.pdfIn PDF document text
    • http://topitoxituzoju.iblogger.org/shark_lift-away_pro_steam_pocket_mop_s3973d_manual.pdfIn PDF document text
    • https://babixedijifaz.weebly.com/uploads/1/3/5/3/135385025/gefogupunasup-diparikasujuno.pdfIn PDF document text
    • https://rojogude.weebly.com/uploads/1/3/4/3/134396813/fibemitusax.pdfIn PDF document text
    • https://lazezareb.weebly.com/uploads/1/3/4/3/134311903/1430532.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/remuv/deguponelevokugoz.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/common_english_sentences_used_in_daily_life.pdfIn PDF document text
    • http://mitotubuxabax.epizy.com/skripsi_akuntansi_keuangan_daerah.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/wapasaw.pdfIn PDF document text
    • http://jupunefubepaza.rf.gd/gibugajamabuxurutosu.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/mesobex.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/lotitilugax.pdfIn PDF document text
    • http://towawemigegi.epizy.com/levokewefibitivibawaligo.pdfIn PDF document text
    • http://wogosozado.rf.gd/wakovogolawenilutozixovas.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_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 10456 bytes
SHA-256: 6ab71b02993766d22d05858ae0c368659543f2b9c08506ac656f1eae26aac083
font_01_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 5464 bytes
SHA-256: 20c39cb3d589cde4c39d656be60072c42de6a9ede0ae1b0ab2c2147beb2dd805
font_02_sfnt_off00011a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A25 10336 bytes
SHA-256: f710ecbef00b0f02b3489459f0bf60cf0fdd9b9d7264f2c9109ae6840cd0096e

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