Malicious PDF — malware analysis report

Static analysis result for SHA-256 f449dd5088225cee…

MALICIOUS

PDF

80.9 KB Created: 2021-03-14 23:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c8acce5f82bf3451fd5b98b82a198fda SHA-1: b10535a5c36b04e0303b426951dd58f90a1d8d1d SHA-256: f449dd5088225ceea981c93f264f68699fabe4f206622e4f7a22b698152b9743
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The embedded URLs and the nature of the heuristics point towards a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=audio+technica+lp60bt+white PDF link annotation
    • https://gapepaweduli.weebly.com/uploads/1/3/5/4/135400658/2778316.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/jggIMcz/rpg_simple_dice_download.pdfIn PDF document text
    • https://cdn.sqhk.co/podidiwi/fheMihj/17811997442.pdfIn PDF document text
    • http://vuvajujuli.mygamesonline.org/how_i_became_a_pirate_musical.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/24241348266.pdfIn PDF document text
    • http://jidapuxedepu.medianewsonline.com/masterbuilt_electric_smoker_split_chicken_breast_recipes.pdfIn PDF document text
    • https://cdn.sqhk.co/sozetojedisu/hfhcDgh/gepotakafutupo.pdfIn PDF document text
    • https://kisisegexorev.weebly.com/uploads/1/3/2/3/132302984/e997689608.pdfIn PDF document text
    • https://dapavivilo.weebly.com/uploads/1/3/4/8/134895477/439a81c.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/IHheYP2/tokaxamutir.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/ghGjcNj/sesogefifigorekub.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/mhhyoEz/kakef.pdfIn PDF document text
    • https://cdn.sqhk.co/fevazufalul/Avif4EV/bach_eternal_cannon.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://uploads.strikinglycdn.com/files/8d4d67a0-0a84-4399-a2af-a7cdd997927d/more_multiplication_properties_of_exponents_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/21299010787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78eef40d-c178-4e61-83ff-ee62cfd353b2/what_happens_during_the_theme_development_part_of_an_interrogation.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/coliformes_en_aguas_residuales.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/does_bill_of_sale_need_to_be_notarized_in_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/fiwigefenejurujozavivilun.pdfIn PDF document text
    • http://moxixezegosa.onlinewebshop.net/microbial_production_of_acetic_acid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 5284 bytes
SHA-256: 977b50756c88cc310ff4a6985f596a326faeba11f6cacef2b0af6fed758ae810
font_01_sfnt_off0000fcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDF 12656 bytes
SHA-256: cebec10a6d09a23db9d9d7d7db67b7606528512882a4f59734777988d378792f
font_02_sfnt_off000126c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333