Malicious PDF — malware analysis report

Static analysis result for SHA-256 93aabc8f1de57716…

MALICIOUS

PDF

79.9 KB Created: 2021-05-29 06:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e9c8def2706005f1e6a15c9b849a7e24 SHA-1: d839b7177c15ba96927a17ccdf0fbafe3c5b37a8 SHA-256: 93aabc8f1de57716632cca9368ff0e2ccfcc2da35f2889c5452d9baf045fa63e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/123?utm_term=variables+on+both+sides+worksheet+doc PDF link annotation
    • https://kozuliwibiji.weebly.com/uploads/1/3/4/7/134705154/lopuvanazivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_604a343f2babd.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/vagirivuwi-ligaxulifiz-winivejirok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444353/normal_5ff459649f730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_6051a461112c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_606356beccafa.pdfIn PDF document text
    • https://walonani.weebly.com/uploads/1/3/4/3/134372970/8549016.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444357/normal_60655788f04de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487413/normal_600624f0d4592.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/muxob.pdfIn PDF document text
    • https://pijewiki.weebly.com/uploads/1/3/5/9/135966210/suzipomiluxibof_vuwazofabawobuz_gewifus_liganuloj.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4409840/normal_60afecb6a7d75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501214/normal_601bbeaf7b60a.pdfIn PDF document text
    • https://xezevatev.weebly.com/uploads/1/3/4/7/134730214/3181102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368763/normal_5fe0e363121e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_60313efcca9ee.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/661188b9-940f-47fa-a2cb-ba47431d963a/which_part_of_a_dna_nucleotide_contains_nitrogen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc1c1699-783e-464d-a934-0b9ae4f72bf1/is_the_florida_driving_test_hard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ec245a-3d3c-4dea-9122-1634f9562dc1/98337727675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cea8cdae-398f-413e-8089-91466b47fe76/71461774825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/907bdb4a-8ca1-44ba-83a3-0075ee7f9f37/infinity_henna_tattoo_designs_wrist.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 5288 bytes
SHA-256: c2401fef494f44b7cffe6b7d15b31a9bb810389dbd63fcc130cbaf88b9407ffb
font_02_sfnt_off0001088d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 11656 bytes
SHA-256: 834cc11c31a19656b3fde65b3b434fec89c3914021fbb53d08c44a43cefd73ce