Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d78c43c200b381c…

MALICIOUS

PDF

128.4 KB Created: 2020-12-17 00:32:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f56ad90acd8e0b9742c91cb7f7a1b482 SHA-1: e891d0aefb98e99954cd40e6031e0bc63768e953 SHA-256: 6d78c43c200b381c1eee95dbeb990ab20aa0a8063b87075a51e266fbeceb3b61
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link directing to a known malicious redirector. The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to malicious sites for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffine.ru/aws?utm_term=history+of+all+prophets+in+islam+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5fa4748839962.pdfIn PDF document text
    • https://dulexarupiwaju.weebly.com/uploads/1/3/3/9/133986428/1134617.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451044/normal_5fa871e918813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491925/normal_5fc108c378822.pdfIn PDF document text
    • https://rimowaxa.weebly.com/uploads/1/3/4/6/134610435/6125935.pdfIn PDF document text
    • https://jagunafine.weebly.com/uploads/1/3/4/3/134363358/33edf37764174f.pdfIn PDF document text
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/8979559.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fcf32308e06c339b86ca5ba/t/5fd728fc5b1f6f7539eff1f8/1607936255469/beverage_air_ucr27ahc_owners_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dbf0116eb00e3c4bba69/t/5fcb889b64036b61438f0710/1607174301563/komuwubiregoniwadodej.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64de3116eb00e3c70d0bb/t/5fd196c3f2ee360040f3e368/1607571139818/parallel_multiple_account_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc77c63f59f035d0ccd600e/t/5fcc016d2fa8bc6bcdd49411/1607205230320/fubetomemorozise.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/the_adventure_zone_graphic_novel.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001c67a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C67A 25396 bytes
SHA-256: 46e224f4b9438d55995bfb874039a9c8315955e81954c5e4262b8623e2509d61
font_00_sfnt_off00017b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B52 5344 bytes
SHA-256: f06f896ffcb25e1a56ec54ffcd5d36b832d1512ccd814c4081b0692523f9e632
font_01_sfnt_off00018d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D59 18832 bytes
SHA-256: cefaec2a994aae350de37e5205445f62868941cc9fd1fa364e43c22a2d86a941

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