Malicious PDF — malware analysis report

Static analysis result for SHA-256 effa4a5400255ba6…

MALICIOUS

PDF

80.8 KB Created: 2020-12-07 16:01:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e2785e1b336227cb36b7f16e7f0c90c5 SHA-1: b47fb91f69345be4b23e44fcb4ea509f350ad859 SHA-256: effa4a5400255ba64ef9be8d8e355a9d9ca47f0558ef1de3a4e13eb9e985b39c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to lead users to compromised or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/aws?utm_term=bully+anniversary+edition+android+highly+compressed PDF link annotation
    • https://sopoxovolofu.weebly.com/uploads/1/3/4/5/134509961/xawuge-nowevowafurovik-tujumizad.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/5787213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_5fc280cee4969.pdfIn PDF document text
    • https://madovokego.weebly.com/uploads/1/3/1/4/131409717/pixanidosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369911/normal_5f8a07371cb70.pdfIn PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/8476882.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/metugobiresa-dojexodibix.pdfIn PDF document text
    • https://lenafalem.weebly.com/uploads/1/3/4/4/134491844/35d03b4a411e0af.pdfIn PDF document text
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/wodexufimekuzof-lipivarenoxa.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/tabuz.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/692f1039-b31e-4db5-a2df-92be303980a7/dream_league_soccer_apk_classic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da4c2c32-6f78-4c15-be73-212131d68f40/54552039669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76523340-e2b4-436a-8128-8cf1c3fe6f44/super_subnetting_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c45e7f8-2073-4658-bb4f-151ff50fd29d/servant_leadership_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d86c097-4cdb-402a-9d7c-7d82bb3de138/gowidufazivuxebowuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23493326-91e2-40a3-97bf-3efe4946bb9d/bikupomawijofuxomexefuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7665e1-153a-4896-829f-9117f61202df/38366332049.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 5700 bytes
SHA-256: a391103f1a96ac062deb23967eb6065221c87bbd9e714146ac2a3c5071ac422e
font_01_sfnt_off0000ec9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9F 3132 bytes
SHA-256: 54bb27680dd8f0bee6813847eb6cd0c030276a5e0cbdfa8f780fe1ffc19bfc1b
font_02_sfnt_off0000f951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF951 10660 bytes
SHA-256: 8c8c592b7cf3562b8ece65c94a36c754a0faaaa21aa721647d8fc9fa5a4cabb7
font_03_sfnt_off00011e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E25 16128 bytes
SHA-256: 2590240ff87d5e84b7fe3f3339fdb1e79c592fbe000e7f099083d275e73d3e39