Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3cefea4c5f23ba…

MALICIOUS

PDF

89.1 KB Created: 2021-03-29 00:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d461517ec2391c5b3f2e0e5b7a676eb4 SHA-1: 216a4264128a6fc6bc1559fef4d8bfd384caca35 SHA-256: 9a3cefea4c5f23ba657ef03db6d90b66e42c276ef5e8f503c2df0e8b74a7d3fc
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF download sites, suggesting a link farm or phishing lure. The presence of a critical ClamAV detection and a high ML score indicates malicious intent. The document body, though heavily obfuscated, contains keywords related to financial patterns, likely a pretext to entice users to click on the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/award?keyword=bullish+bearish+patterns+pdf PDF link annotation
    • http://majovevalaji.sportsontheweb.net/business_model_generation_deutsch_download.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/risafusefurawutedivi.pdfIn PDF document text
    • https://navemozozaju.weebly.com/uploads/1/3/1/1/131164567/vokakanazovol-gevomuziru-xopimiwufuf-pemijawizuduruw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411935/normal_60482aa34a707.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/gevijobogevi.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/3e439934486c7.pdfIn PDF document text
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/8422629.pdfIn PDF document text
    • https://kerumesuni.weebly.com/uploads/1/3/4/1/134131613/7500060.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_6017a2ebda60f.pdfIn PDF document text
    • https://xuniruki.weebly.com/uploads/1/3/0/7/130739043/8e5d194a28dda1f.pdfIn PDF document text
    • https://nunavataregexo.weebly.com/uploads/1/3/0/7/130775742/7823931.pdfIn PDF document text
    • http://kimokabif.medianewsonline.com/sibawerilivekivajud.pdfIn PDF document text
    • http://xixofafil.medianewsonline.com/87370318497.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/3cd4805c905d.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
    • https://s3.amazonaws.com/fazujo/yamaha_ypg_535_price_philippines.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/online_hotstar_video_er_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/sony_rx100_va_vs_vi.pdfIn PDF document text
    • http://duvodix.myartsonline.com/divuwanobak.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/13th_amendment_text.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/brooms_head_surf_report.pdfIn PDF document text
    • http://famekuputoda.myartsonline.com/58067999224.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/homelite_26cc_blower_wont_start.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/pifupurisorufod.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/lietuvos_ryto_tv-_reporteris-_video.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/66531924295.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_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 5088 bytes
SHA-256: d5305becf3fbf4101d376eac5866d071efec1ca76a7bbfde50fd3fe2b0a6135a
font_01_sfnt_off000120fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FE 11184 bytes
SHA-256: 19c790bc6150a7b09c98b048e02f8c0446fb3ce3d5d703c1978f80a7887b3ed6
font_02_sfnt_off0001472b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472B 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e