Malicious PDF — malware analysis report

Static analysis result for SHA-256 af049520b18b79f1…

MALICIOUS

PDF

77.1 KB Created: 2021-05-14 01:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 30928aabfb07cdf52656bdf1ca6016d6 SHA-1: 43142a9b9dae779c8c4d181fcc63949d278ab5f9 SHA-256: af049520b18b79f11f1a847f358841a9e952f48731ad3cfd017332e915367c6d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to search engine optimization or informational content, directing users to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=what+are+the+traits+of+a+good+man PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488139/normal_600b1ade3389e.pdfIn PDF document text
    • http://table-wait.com/baofeng_uv-5r_plus_two_way_radio_dual_band_long_range_walkie_talkie30qpq.pdfIn PDF document text
    • http://meetporte.xyz/john_deere_d140_battery_replacement75ui0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_60525376e44ff.pdfIn PDF document text
    • http://istra-backwater.ru/agatha_christies_poirot_season_13_episode_5d4r5u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_5fdc30b7c6c0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490129/normal_5fe76c6c24a67.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/ladojenefe/antivirus_free_for_windows_8_avast.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_42fcd487b8cd400795047d352853c481.pdf?index=trueIn PDF document text
    • https://d00444dc-369f-4f91-8e39-e9f98c43fd35.filesusr.com/ugd/76de1a_da7d1ef0e55841d0817d623844266232.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_05f2eeb86258401cbcd337868743ef44.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/fodatuginakukepudesabes.pdfIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_d583af1f38a64eeb89a3f43ca9029ad0.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_155a64a381fb459ba04e56a0efbceeae.pdf?index=trueIn PDF document text
    • https://ff5ab256-a407-4697-91b9-141751226614.filesusr.com/ugd/4205e4_0cfc64dc06d14426b055ac393254339d.pdf?index=trueIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_0960585d4fef4149a02aa3424049c45b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/how_to_use_google_street_view_live.pdfIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_bfdd2df6390340f586312f94a13e7e33.pdf?index=trueIn PDF document text
    • https://6bc61794-ec17-45f1-96eb-8bed4cd57308.filesusr.com/ugd/217b8a_7fa86e3011a84c2aa62186d627b9fd8f.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_c194701f843a4032b29a67806dfe55c4.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_099a9fcda0034713b4652c30805d15db.pdf?index=trueIn PDF document text
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_fa68070858624088a749a59e00c6a84c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/bekadutaxejogarix.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_79000727bbbd4382984d03b7e73ac754.pdf?index=trueIn PDF document text
    • https://31f314b5-0768-4c24-bd49-4596ea953b46.filesusr.com/ugd/85a4b1_55a238b92c1e4aa88ecddec402000279.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/cours_grammaire_anglais_gratuit.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 5304 bytes
SHA-256: 94720fd5ed04f74ee12eea7f02eb7eb6eb25ae5559f3aadedc97fa470d2a0ef9
font_01_sfnt_off0000ffb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB7 11060 bytes
SHA-256: 98bf8b8f19b18c9cc0fe2b601c2a72e234b35fb6a0d94b44ac7e92f3560f2183

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