Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f1fb834b90efe1…

MALICIOUS

PDF

86.5 KB Created: 2021-04-01 03:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ca41025717a56e76ee83979b03d71136 SHA-1: 490bf4b9f5059560a14a5f5537aef217f4d6403b SHA-256: 41f1fb834b90efe1a91d096338040febbfef92d8aaf1c1d897f72f090aeb7091
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 pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jacksth.ru/123?utm_term=sephora+bubble+sheet+mask+review PDF link annotation
    • http://serururepus.scienceontheweb.net/belanuziniputa.pdfIn PDF document text
    • http://cabinetshub.xyz/the_mortal_instruments_settingd9dn2.pdfIn PDF document text
    • https://zevenilusowaj.weebly.com/uploads/1/3/4/3/134324486/81f25c99508263b.pdfIn PDF document text
    • https://xovigojimere.weebly.com/uploads/1/3/4/8/134854331/xumakexizulu-gewudo.pdfIn PDF document text
    • https://dubujede.weebly.com/uploads/1/3/4/6/134607356/rimulobelukupom-datitimawamuwe.pdfIn PDF document text
    • http://smartcreditcheck.info/aba_english_apk_premium_20199risr.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/pipiso.pdfIn PDF document text
    • https://teraxamexad.weebly.com/uploads/1/3/1/3/131380600/zeragofaterono_tirugimuj.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/tratamiento_actual_de_artritis_reumatoide.pdfIn PDF document text
    • https://waduwira.weebly.com/uploads/1/3/0/9/130969623/vagaru.pdfIn PDF document text
    • http://tikovg.xyz/best_music_of_the_90s_and_2000sq19lo.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/30194aa.pdfIn PDF document text
    • http://penageli.getenjoyment.net/dalife.pdfIn PDF document text
    • https://porujeworor.weebly.com/uploads/1/3/2/8/132814718/xakifibaxugixa_kuwofi_wugupajevorile_waziku.pdfIn PDF document text
    • https://japafapu.weebly.com/uploads/1/3/1/4/131437770/977620.pdfIn PDF document text
    • http://bitsracing.net/94310662725urmbm.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/how_to_dilate_by_a_scale_factor_of_2.5wy0w5.pdfIn PDF document text
    • http://gusevoxuzuwelap.mywebcommunity.org/6th_grade_math_common_core_worksheets.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/4707d9bc-38e8-4d3a-aafd-b2fc1caf0438/ge_xl44_oven_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca8b13b-2a0b-4231-b8c4-00b14dc89722/ejercicios_de_verbos_regulares_e_irregulares_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b226fef2-0d5e-4480-9341-05838f4fdaea/how_to_get_bios_password_for_hp.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/32979652695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/627c532a-fb7e-496c-873c-b27160a17fee/google_cardboard_vr_headset_amazon.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_off0000e9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C7 5516 bytes
SHA-256: b76b2faf81c72b5111a516357c91b434e9b27f6cbaac9a9923bea86f600d2f90
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 1852 bytes
SHA-256: 7f1fc89d230b21cdf1c6da576e651cd8d1038c1fc087e797b2b55c3b3618ee60
font_02_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 15960 bytes
SHA-256: 3ae966ecf01893bdc6bcf6bcafe2862d34bd49bb6ecedd83016290c0e0ec9190
font_03_sfnt_off000136b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B5 16240 bytes
SHA-256: 72456a6d6cd95ebc08379530a2cb9f29d8ba054b28fdc78b9142b5572a46dd1a

Open this report in the interactive analyzer, or submit your own file for analysis.