Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f86565b495287b…

MALICIOUS

PDF

76.4 KB Created: 2021-02-26 05:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d59e3b5caa20b5406044a5a047faf9c5 SHA-1: 04cc9a49a4a0909730addb6adb0f999101cee600 SHA-256: a7f86565b495287bbf0c3455513441f1088f35e5c28eb6634844dc9610cf9a89
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 pointing to PDF files, suggesting a link farm or redirection mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign.

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://seumenha.ru/123?utm_term=best+internet+service+providers+in+mumbai PDF link annotation
    • http://lilubaxubaxulu.sportsontheweb.net/monadunolugi.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/82675572048.pdfIn PDF document text
    • https://zuvumurujibuza.weebly.com/uploads/1/3/0/7/130739557/7828012.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/iifThhc/lagegibiwogobusagixonizu.pdfIn PDF document text
    • http://vixixar.22web.org/20066498322.pdfIn PDF document text
    • https://xitozenajoxoge.weebly.com/uploads/1/3/2/6/132681812/wojukimekijujinebek.pdfIn PDF document text
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/7cdcbcee32.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/xovajukoxin/guidelines_for_domestic_air_travel_in_india.pdfIn PDF document text
    • http://redexini.epizy.com/jenesutijatofozakokazekuf.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/84377976141.pdfIn PDF document text
    • http://zorogeloma.epizy.com/chrome_app_for_pc_windows_8.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/sears_craftsman_garage_door_opener_battery_backup.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/mosajig.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/79471813287.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/nuzevoxapumekalaru.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/32982408813.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/22821685670.pdfIn PDF document text
    • http://lowebabufi.rf.gd/80284619500.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/54380972177.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_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 5436 bytes
SHA-256: f54749416d108ab88e6e92a3530288ca37ac4d8cdf095ddf25aefdbfe3e9633b
font_01_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 10788 bytes
SHA-256: 902acb699c2eb5bb87c7ffa901f41b67725d6504c4dca056514328aa17e1041b

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