Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe6a013d8cb15216…

MALICIOUS

PDF

71.6 KB Created: 2021-05-23 19:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 49e58dde1ed2aaa30c94c1b7ae3157d3 SHA-1: 29308b98b0e2329ce2a19ca5fac628012c63e824 SHA-256: fe6a013d8cb15216ea1ef171125a68262fa338068fe23c278bb2475afb08e7d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The primary URL, https://botokaw.ru/strik, is associated with a search query for a specific book, suggesting a lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users 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://botokaw.ru/strik?utm_term=voet%2527s+principles+of+biochemistry+pdf PDF link annotation
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/vimani.pdfIn PDF document text
    • https://nikovazof.weebly.com/uploads/1/3/2/6/132682709/3292275.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/fololelinajezawexaxo.pdfIn PDF document text
    • https://wajufavex.weebly.com/uploads/1/3/4/5/134587400/futako.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/9235403.pdfIn PDF document text
    • https://begazasageb.weebly.com/uploads/1/3/1/6/131637419/ad1dd38.pdfIn PDF document text
    • https://rimimasosonajis.weebly.com/uploads/1/3/2/6/132681992/fca0aa1f778b70b.pdfIn PDF document text
    • https://warenumew.weebly.com/uploads/1/3/4/8/134871813/6d2df6.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/nigimul/bhojpuri_movie_video_mp4_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/the_sounds_of_english_-_phonetic_alphabet_-_english_pronunciation.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/98568539213.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/sujopusirulizaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/632e1576-be83-4ded-a3b4-08aec7d3d2fd/48419916574.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/38072086533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a700b75-df63-4989-9ccd-78e9ec3fcee3/xuburixudebotopexejupixav.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/do_you_capitalize_the_day_of_the_week.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1de7d5a4-4eb2-4c25-b5f0-a5a31f51c3b7/69052542863.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/ethical_issues_in_business_a_philosophical_approach_8th_edition_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/32919077007.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/format_number_js_commas.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/chinese_song_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/38328141059.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_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 5428 bytes
SHA-256: 09e7f3671e9fe2f0cead5a1b6f03fab27439baa1dc790bf1f290be4dbdc8f0b5
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 10292 bytes
SHA-256: af27598305928e179dd958b21d4bed0f797691c00854343b0be8996d57df7884

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