Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd37dafa41b142bc…

MALICIOUS

PDF

80.1 KB Created: 2021-02-23 13:52:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b8b494ffb9ec95fdbaf80d762fef5862 SHA-1: d0ec3f91a96b01c4ba1b428f2c942cbc209ad730 SHA-256: bd37dafa41b142bcd826fe4b2994d3d06e36fe4858361061e243fe49febac039
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting or Weebly domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to employment earnings in Dubai, intended to drive traffic to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/123?utm_term=how+much+do+security+guards+earn+in+dubai PDF link annotation
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/5fa05.pdfIn PDF document text
    • https://nevidabaxava.weebly.com/uploads/1/3/0/7/130775666/be757e150.pdfIn PDF document text
    • https://rojuligu.weebly.com/uploads/1/3/0/9/130969709/lufazifumanene_kevokegubidoxof_gefuxed.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/bleach_vs_naruto_3._2_pc.pdfIn PDF document text
    • http://itactical.xyz/geethaiyin_raadhai_tamil_movie_download46s1l.pdfIn PDF document text
    • https://petominezejoza.weebly.com/uploads/1/3/2/3/132303337/4280976.pdfIn PDF document text
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/vixonisepiwig_jumononokorog_nebip.pdfIn PDF document text
    • https://tilijaxak.weebly.com/uploads/1/3/1/3/131381787/6873236.pdfIn PDF document text
    • http://paruvam.22web.org/kodifexabilukaposunasit.pdfIn PDF document text
    • https://reravonox.weebly.com/uploads/1/3/1/8/131856904/dutogutewemu-gapobanimoj-topineku-xebinax.pdfIn PDF document text
    • http://sarerokedatijaw.22web.org/6120508980.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dixomivagarulo.rf.gd/tagatijobesuron.pdfIn PDF document text
    • http://zegifuf.epizy.com/zolajozomuzelumadit.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/chicken_tikka_masala_takeaway_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/answered_prayer_baby_girl_name.pdfIn PDF document text
    • http://zunedolu.rf.gd/are_there_books_missing_out_of_the_bible.pdfIn PDF document text
    • http://gejevebo.epizy.com/danemesa.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/hr_process_document_template.pdfIn PDF document text
    • http://zuwapiw.rf.gd/dolby_atmos_android_app.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_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 5500 bytes
SHA-256: 1a48d3e048c8ff31a38e54f9df0b5839d3a5a986fe9dd8a0842358f8d04ccbd9
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 10292 bytes
SHA-256: 42543492a07831f11cd09be71b80b9b5daaec3c5329d64462bfde1396e7015c5
font_02_sfnt_off0001251f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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