Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f18f289cb60345c…

MALICIOUS

PDF

69.5 KB Created: 2021-02-22 06:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d09efcf4517ca28dcb18ca739f6c545 SHA-1: 524d79890d36518ee5d2c337a6940915e13fedba SHA-256: 8f18f289cb60345cc44cdb60f7e57f518c20edc03b76bc20822ad13d3245348d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, appears to be a lure related to calorie information, which is then used to redirect to malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/strik?utm_term=how+many+calories+in+a+medium+vanilla+chai+from+dunkin+donuts PDF link annotation
    • http://help-igcopyright.xyz/how_to_calculate_calories_in_food_australia7wmoy.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/cApjga1/toniwivozajikupad.pdfIn PDF document text
    • http://sodaapp.pro/xazisinolumizorumiwivalebs5vq.pdfIn PDF document text
    • http://kyukty68.xyz/triangle_congruence_coloring_activity_answer_key_dinosaurgxwvr.pdfIn PDF document text
    • http://edayafar.xyz/hp_laserjet_p2050_series_pcl6_driverdfj1m.pdfIn PDF document text
    • https://xebuwonivaxatev.weebly.com/uploads/1/3/2/6/132696015/ponevopubikale-gubalo.pdfIn PDF document text
    • http://topmassage.net/injustice_2_harley_quinn_cosplayjdzza.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/hjKByii/31867075935.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxaroposa/Kwiiic4/fibulesino.pdfIn PDF document text
    • http://paypallsecurity.com/gta_3_trk_modu_indirzsd2y.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/xeneti-refogaliz.pdfIn PDF document text
    • https://resezavurafufok.weebly.com/uploads/1/3/1/4/131407395/9799469.pdfIn PDF document text
    • http://bizelapeto.iblogger.org/yaml_auto_format_vscode.pdfIn PDF document text
    • https://zuzumesagodufen.weebly.com/uploads/1/3/2/6/132695194/5125472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixuzomobe.epizy.com/como_fazer_assinatura_digital_em.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_off0000d25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25B 5540 bytes
SHA-256: 8a0675eb170f442ee1680fd4dcf67b19facef41e4161b84257104b06e4231d64
font_01_sfnt_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 10212 bytes
SHA-256: 45909e460ea37db8410289bb8f520dd92ec772fbc257f91da514a2c7317f1d02

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