Malicious PDF — malware analysis report

Static analysis result for SHA-256 660e8190076128d6…

MALICIOUS

PDF

70.6 KB Created: 2021-04-24 13:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 17ea85227099b20a7bbea1e00c50c415 SHA-1: 04e1402584662ceff78c594f7b85acc346e8be00 SHA-256: 660e8190076128d61233245afbae64b42214b9e6d193f4a81c5280da66bf1156
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, directing to various websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/strik?utm_term=calendario+escolar+sep+2019+puebla PDF link annotation
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/vagarapiwa_lobaneza_kubivekitil_sinorudidigiruw.pdfIn PDF document text
    • https://mitumusifunezu.weebly.com/uploads/1/3/5/3/135316179/0bac16a.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/12fd84da82920f8.pdfIn PDF document text
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/bosezekabavef-lesekuruje-befuxekogup-dexeje.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/lixufugovakutenexerijub2eys.pdfIn PDF document text
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/9346848.pdfIn PDF document text
    • http://iglivesupportteam.com/all_trigonometric_formulas_for_class_1201bwm.pdfIn PDF document text
    • http://betmoy57.com/53170463859v10zo.pdfIn PDF document text
    • https://gediwidamavuluv.weebly.com/uploads/1/3/5/3/135348022/3131346.pdfIn PDF document text
    • http://creampiepow.club/hashtags_for_instagram_photographyladsa.pdfIn PDF document text
    • http://wafixevewitope.mypressonline.com/administrao_pblica_angola.pdfIn PDF document text
    • https://dunokosira.weebly.com/uploads/1/3/5/3/135349308/milusirudug-vefavo-rakazu-nowavaxuze.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/celine_dion_ne_me_quitte_pas_lyrics_translation.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/6177017.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/wibadinavosunom/takilod.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/e46_m3_transmission_fluid_change.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/ubiquiti_unifi_uap_ac_lr.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/zapazewipenituzowulekuw.pdfIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_a8038d1397354af388d21214fe076c58.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_4fc48309c1324eda85490f336907c4ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/29187071384.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_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 5592 bytes
SHA-256: 73643fd30302959ec43be7fa293dfa0b245a0ef00beaeabc53b12d6b4a0c4f5c
font_01_sfnt_off0000e736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE736 11228 bytes
SHA-256: b26e76a94b89effa2c46a1dfb29f82d3bba30865080f4903455dd54af6260b08

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