Malicious PDF — malware analysis report

Static analysis result for SHA-256 be736290443970b3…

MALICIOUS

PDF

73.8 KB Created: 2021-02-28 22:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3f095531ac629491b048e1af74cfe811 SHA-1: 4501957b4ebeb03752e604a29e8a5813a516741a SHA-256: be736290443970b3b3dd6999a55314f94a47704fd69504c699e67a610ff213af
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a PDF SEO link farm. The primary external URI points to a search query for drivers, suggesting a lure to attract users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through the linked PDFs.

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://zajinet.ru/wb?keyword=realtek%20audio%20driver%20for%20windows%207%2032%20bit%20free%20download%20hcl PDF link annotation
    • https://cdn.sqhk.co/wudajelu/eigjage/skins_cast_season_2.pdfIn PDF document text
    • https://vogexuweju.weebly.com/uploads/1/3/0/9/130969932/78b789.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/hdG60ig/wiloxoloruti.pdfIn PDF document text
    • https://cdn.sqhk.co/vedimofaw/LtXjbAY/flappy_bird_creator_tweet.pdfIn PDF document text
    • https://kibopomirisusi.weebly.com/uploads/1/3/2/7/132741064/8940830.pdfIn PDF document text
    • https://jarofuzaduse.weebly.com/uploads/1/3/4/5/134502270/jivesowibanikarifu.pdfIn PDF document text
    • https://rudazijix.weebly.com/uploads/1/3/1/4/131453676/wegabuwosubopug_wesabilipatabum.pdfIn PDF document text
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/fowil_bidewisiv.pdfIn PDF document text
    • https://turudesufexo.weebly.com/uploads/1/3/4/1/134131379/b7402a80b3.pdfIn PDF document text
    • https://lamipozalunem.weebly.com/uploads/1/3/5/3/135308558/1980201.pdfIn PDF document text
    • http://nizagose.66ghz.com/kogas.pdfIn PDF document text
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/vejoxadu.pdfIn PDF document text
    • https://cdn.sqhk.co/jekidase/TSQVgco/12471725582.pdfIn PDF document text
    • https://sebumeganajili.weebly.com/uploads/1/3/0/8/130874272/4033615.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/wibedubosateg/rawememedogelefuju.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/36745533550.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/26339322561.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/71445877085.pdfIn PDF document text
    • http://bemuvubovewe.epizy.com/bizhub_206_user_manual.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_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 5848 bytes
SHA-256: 4d97d8f50c03b2027da7598e9a99c1bea248cdc7275bd783aae6e7a16a6e8247
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 10164 bytes
SHA-256: 133e72e29fffe74137c72f93fdabc79a88bb63433f6a378fafd27a5684318b7e

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