Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4926b32f5c20e2…

MALICIOUS

PDF

74.6 KB Created: 2021-03-10 23:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f62e0cf41774f458d4736810a1775ed5 SHA-1: c966863bf7d0398e55aa43b6209861369587335a SHA-256: dd4926b32f5c20e2250c598bbdb39443d623c56cb382f3013b96c3ef3401d474
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary URL points to a resource that appears to be a lure for phishing or malware distribution, disguised as a development essentials PDF.

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://resalured.ru/award?keyword=android+studio+3.+5+development+essentials+pdf PDF link annotation
    • https://valojeruxul.weebly.com/uploads/1/3/4/6/134681631/3166462.pdfIn PDF document text
    • http://pefumaviba.22web.org/how_to_use_up_apple_jelly_in_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/fejisedetu/gfhMggi/wuzajuvowebofumevuwojobom.pdfIn PDF document text
    • https://cdn.sqhk.co/vivokunavu/hjijf6D/airbnb_login_host.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/zE9lgiA/kiwejet.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/WJihEXY/cats_crash_arena_turbo_stars_hack_apk.pdfIn PDF document text
    • http://vujivozopix.iblogger.org/am_i_average_looking_or_pretty.pdfIn PDF document text
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/917d3.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/aMje7qq/drag_race_death_drop_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/hgiiijc/you_break_it_we_fix_it_wichita_ks.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/iehe1ij/mikecrack_canciones_diamantito.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/hjdid5e/constitutional_democracy_definition_geography.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/ghgiUhg/19956877389.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/fM9ifid/how_to_make_origami_crane_easy.pdfIn PDF document text
    • https://kodetinerimaguw.weebly.com/uploads/1/3/5/3/135347088/nobuzekipusumem_zujol_davewadafobis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_7e6d42dac1054393bdac396bb3d1f23c.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_2e3a71634a3444f98f3a92ef69191001.pdf?index=trueIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_2abc7526a9ea4d64a341df606008737d.pdf?index=trueIn PDF document text
    • http://xutasiwewuzaf.rf.gd/guide_michelin_belgique.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 5436 bytes
SHA-256: 00e50c52008658e5ec6f05329a134ee3761ff7ebc93307d1caf76dcc4161bbcc
font_02_sfnt_off0000e9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DB 10160 bytes
SHA-256: c32efb370ce508252ed208919cc2a3a66bb39b591664990b7d6dfbb9230e4148
font_03_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176