Malicious PDF — malware analysis report

Static analysis result for SHA-256 d635a022228b3401…

MALICIOUS

PDF

76.7 KB Created: 2021-06-09 23:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d0008fa2e23b86dcc1cb7e01b97cdfa9 SHA-1: ae15c40e56cb4b4501c0ffe9d789e585de462641 SHA-256: d635a022228b3401c50bc186ebfaa8488fd665ef4c52e3489231d6c5399a5311
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, including a prominent redirector URL that appears to be part of an SEO link farm designed to lure users. 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 embedded URLs suggest it's designed to redirect users to malicious content, likely for phishing or further malware delivery.

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.
  • 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://philabc.ru/pbw?utm_term=baldi%2527s+basics+online+game+no+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470535/normal_60192bd118543.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_601182023e228.pdfIn PDF document text
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/kewedofozupidu.pdfIn PDF document text
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/xediru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_603294db353b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_601afa3cab8f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_602096d93819b.pdfIn PDF document text
    • https://nudoguku.weebly.com/uploads/1/3/5/3/135306062/ab8324fc242a.pdfIn PDF document text
    • https://xekumubuwufalag.weebly.com/uploads/1/3/5/3/135345963/7441224.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff309bdc-30d0-42f1-b40d-a42ac9b23504/hitachi_excavator_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0732d6cb-afb2-4d88-b8fd-72ccdf893d18/wordpress_user_roles_database.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c59b855-6feb-4f28-be0e-01cb56c8511f/84851786562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ebfa6d3-db5b-4c89-8a2d-b73babf5bebc/briggs_and_stratton_17.5_hp_engine_compression_release.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86bdfeb9-a34a-466a-aa1b-7a4857620444/91356679430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69f4552-b267-442a-adaa-5dedb2edc17a/titasoxenazubok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ff0447-12cf-45e4-8fae-d3197f6b6a3f/wasarowefapomopiru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deab4df2-fd74-4320-bae7-04b02c8c96cf/finding_interest_rate_and_time_in_compound_interest_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5783d289-3fe7-4d86-96c7-f7c935ca9a4a/kabarapaf.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_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 5480 bytes
SHA-256: a04763436240b4e36831b12c0e2ca348faa3a0cbdf6103aab6d54fbcd7947d89
font_01_sfnt_off0000fffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFB 10908 bytes
SHA-256: f37e741dada61fe34fc041914977bdd2adc7c7e87e4fe4104fee5138df61ee71