Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b8a6b396cd8b74…

MALICIOUS

PDF

68.7 KB Created: 2020-11-11 16:44:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9e6450007e96fdd30517868009ac9bea SHA-1: e84ac6c88f37c4fba85c9969b16ac95870b1b2e8 SHA-256: 74b8a6b396cd8b74f64df0a860e35a4765ec463c1301edcf56e9776369498734
254 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to redirectors and SEO link farms, indicating a phishing or scam attempt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest this. The embedded URLs are used to host or redirect to malicious content, likely a phishing page or further malware. The ML classifier also flagged this PDF with high confidence.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=thunder+tv+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4483083/normal_5faa0260155d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5f92952c220cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_5f8da595d53dd.pdfIn PDF document text
    • https://moguvikob.weebly.com/uploads/1/3/0/8/130874292/51ff456bbdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f8c0a14dba68.pdfIn PDF document text
    • https://vezorobabuwej.weebly.com/uploads/1/3/0/9/130969079/8915768.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/rudup.pdfIn PDF document text
    • https://kirimanadawa.weebly.com/uploads/1/3/4/3/134383910/910311.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/ecce1a97-6939-41d3-aeb3-ad482ac0bf74/sony_homestream_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4506b85e-9df5-4641-b3f5-df91ada55a54/89641861299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c571ce53-f101-49f8-a180-aaa8da375c1a/wagilot.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/36061653523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d350c5-4d3f-471f-ae1a-b6b055679e0f/flower_structure_and_reproduction_worksheet_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/56000054708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168c3fa4-93e4-47bb-aa60-fa750f0d0d7f/tusijezigumabomotori.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_off0000c7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DD 4908 bytes
SHA-256: 1c393197c8cdabc5b1ee43d2560ea487bce26443731043a2a654ae67beadfe2a
font_01_sfnt_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 10716 bytes
SHA-256: c2011bfe6aa3330dba96548394edcd6edb8795740a50e7e4a763e13291167f36