Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f14964b0f57cbde…

MALICIOUS

PDF

66.4 KB Created: 2020-12-24 02:16:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 89bd6e6bcdb3ee6ffb95ea3a5682b9aa SHA-1: 1016c375df95c86e2e2ba8bbff97980a83320712 SHA-256: 8f14964b0f57cbde4452f869539012b5d4c770fda10f8957db2bd2747c19c3b8
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'subject complement worksheet with answers pdf'. The presence of a malicious redirector and a large number of external links indicates an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=subject+complement+worksheet+with+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5fb6f094a1608.pdf
    • https://netulomite.weebly.com/uploads/1/3/2/8/132814473/nofuxebunem.pdf
    • https://lawagupavuraxap.weebly.com/uploads/1/3/4/6/134616311/7546159.pdf
    • https://cdn.sqhk.co/merodobiweve/7kcejig/xeruxigonelopubevatixeli.pdf
    • https://cdn-cms.f-static.net/uploads/4450356/normal_5fa689e5bb2e4.pdf
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/borigodipi.pdf
    • https://cdn.sqhk.co/bidubuwawi/5ijLHdw/57475320604.pdf
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f876cdf63b75.pdf
    • https://static.s123-cdn-static.com/uploads/4388183/normal_5fcc7d065bdc3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/775d5b1b-e818-4c3c-bcdf-93cad05a8f2a/outliers_gladwell.pdf
    • https://uploads.strikinglycdn.com/files/4c7e5b88-04c0-4a7a-836b-e42055f464b7/26588711472.pdf
    • https://uploads.strikinglycdn.com/files/28ebc865-4d33-4859-a9ec-7be8dd121c1c/mom_breastfeeding_porn.pdf
    • https://uploads.strikinglycdn.com/files/ac6968a5-d44b-4a9f-b0ca-0d84c661d9ca/gexifomokolevudajogezo.pdf
    • https://uploads.strikinglycdn.com/files/d2215bb7-cbfa-4ce5-bb0b-d3dcf114e28a/lovobenusamamurowe.pdf
    • https://uploads.strikinglycdn.com/files/8fc77049-8038-46b4-a7ca-126717047f59/38416320823.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c459.bin
8bd262a3e3eb0658011ca774da75af7533cf250f7037b20dafc619f5d9083102		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC459 5872 bytes
font_01_sfnt_off0000d839.bin
04ecd81296cda2b54bc99f85699a88a9387d1131f81ea9f6cffdd346e41836f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 10584 bytes

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