Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a48d818ee0e8908…

MALICIOUS

PDF

70.3 KB Created: 2021-02-18 16:14:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1569ac8e1b4c04ba6defa33de8d48b5f SHA-1: 5f34e254e5270993eaafc601fad8729c0e3dbef3 SHA-256: 8a48d818ee0e89089164846619738176973e41618c92ad469cbe3774478cbbcf
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' suggesting a large number of outbound links. One of these links, 'https://maypoin.ru/strik?utm_term=hbs+760+price', is directly associated with the file's metadata and a heuristic firing. The presence of urgency language further supports a phishing or scamming attempt. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to external, potentially harmful 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://maypoin.ru/strik?utm_term=hbs+760+price PDF link annotation
    • https://cdn.sqhk.co/vuwipabobatu/gjajhia/crack_bubble_shooter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475874/normal_5fc6bbdbe8b44.pdfIn PDF document text
    • https://cdn.sqhk.co/xumifutave/fyhahhz/miberanodigivixibewulavu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469359/normal_5fca6fb4780dc.pdfIn PDF document text
    • https://tesurupijirixu.weebly.com/uploads/1/3/0/8/130813669/pibimizirotasuvox.pdfIn PDF document text
    • https://reragoposezexel.weebly.com/uploads/1/3/5/9/135958934/4148082.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/putelekireza/cleaning_services_business_cards_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/acrimony_full_movie_free_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/all_government_jobs_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/lunom.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/zeteludofadog.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/tibominona.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/98695273672.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/82400073624.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/blender_2._79_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/last_day_on_earth_android_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD73 5164 bytes
SHA-256: 5e9218ba4f7b066462ab28569fa8b33c85792cade96af12d5885cf1f0e50bf47
font_01_sfnt_off0000cf16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF16 11340 bytes
SHA-256: fb94965c30a2075cbff93a73b438033307875bd3fe75e7c260563b7acdd49abd
font_02_sfnt_off0000f5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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