Malicious PDF — malware analysis report

Static analysis result for SHA-256 35bffdc48574b13c…

MALICIOUS

PDF

70.5 KB Created: 2021-01-15 06:33:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 215e6982c8cedccc83ffb13683689eca SHA-1: 01a78930f1888adc24ce2479c444aee74139c751 SHA-256: 35bffdc48574b13c909ce0b5112397d62c82634eb452d59106c426e9fcde8960
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, particularly those hosted on Weebly and Mozfiles, suggests a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics point towards techniques used for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=fly+fishing+pompano+beach+florida PDF link annotation
    • https://wivixape.weebly.com/uploads/1/3/4/8/134897282/6895391.pdfIn PDF document text
    • https://nodaveto.weebly.com/uploads/1/3/4/2/134266094/tosizozava_kamedenunodez_binuv.pdfIn PDF document text
    • https://site-1239447.mozfiles.com/files/1239447/dainik_bhaskar_epaper_bhopal.pdfIn PDF document text
    • https://vepifedufonun.weebly.com/uploads/1/3/1/4/131454255/0ec5f5e8ea742.pdfIn PDF document text
    • https://site-1168049.mozfiles.com/files/1168049/44688391980.pdfIn PDF document text
    • https://sibomimotilelib.weebly.com/uploads/1/3/4/2/134235458/loxutopudafire_fekemosozopu_sodoworutigikex_parilekoguxop.pdfIn PDF document text
    • https://wurilulisewanid.weebly.com/uploads/1/3/4/7/134728532/pewozukefak.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/fizufapu/fevofeparubaxuv.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/brakebest_brake_caliper_guide_pin_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/43949841169.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/company_of_heroes_2_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/best_video_chat_for_apple_to_android.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_off0000d333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD333 5764 bytes
SHA-256: 0a38405e9a72e77da7f7f9d7c3ada6707049d8c73e4f0472041040305f0a9142
font_01_sfnt_off0000e6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 11396 bytes
SHA-256: dbfffc1a4044241b116cd759e06c057ffa904019f1c0c7cafb1639b69200bed7

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