Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aec0730823de076…

MALICIOUS

PDF

70.9 KB Created: 2020-11-09 22:38:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 54b015c4768604fe27b09d0018354f4a SHA-1: cb1a5c8a4b508d2bcdb54b113e3d104919930793 SHA-256: 7aec0730823de076a87dfca799a64f5979a87ece784e50318859a8430d1ef5ad
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' pointing to a suspicious URL and a benign-looking PDF. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic and the ClamAV detection further suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?keyword=osu+top+skins+2019 PDF link annotation
    • https://birebojutadavom.weebly.com/uploads/1/3/4/3/134342015/0b13264ee72c0.pdfIn PDF document text
    • https://gejimedetudumi.weebly.com/uploads/1/3/3/9/133997730/vosumibale_jojerido_zevelinenepit.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/5853934.pdfIn PDF document text
    • https://memumozevevu.weebly.com/uploads/1/3/4/3/134378747/2173384.pdfIn PDF document text
    • https://jamitugila.weebly.com/uploads/1/3/4/0/134012499/8901904.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/cbsd_email_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97de4b63-af3a-49b5-b653-304ca64e55f0/36413481447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecdd2cb5-4f64-46b9-88f9-ef3cbb93d90d/pusojeritosuxusomabide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cdc2051-c63a-46b4-8755-e19355ab8f69/56606652068.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/no-no_boy_full_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12dd4ba9-a8ff-4a17-a33f-e77aef7031d0/28639511258.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/morphology_of_bacterial_cell.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC140 5048 bytes
SHA-256: 13247a075ebcf2672d3cbbc9defae653a9f0020b418e7fe58a11ceae282b55c6
font_01_sfnt_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 11064 bytes
SHA-256: 45f26b0326bb8fde56476ae31a19e38575757f4a23a20973ebefd98c13f266e7
font_02_sfnt_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 16492 bytes
SHA-256: d5c6a6eafe5a4179aeb6e2b70fb1a54e884e53b4c23c9b347817bd4fa3c7fd01

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