Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa781bb1935f64c4…

MALICIOUS

PDF

88.1 KB Created: 2021-03-11 12:00:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9136062a6065f33799512c3556418e48 SHA-1: 5a704012d4e7ef52215d0a3aa23e518b566230bd SHA-256: aa781bb1935f64c4761370d8921857fdc640c04e0a204c4f12f072425e67574c
126 Risk Score

Malware Insights

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

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 0.9997

Heuristics 5

  • 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 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/wix?keyword=projectile+motion+quiz+answer+key PDF link annotation
    • http://selectgetc.top/finite_geometric_sequencencu9b.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/rolipuzosezan.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/3523642265.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/focusrite_scarlett_4i4_3rd_gen_price_in_india.pdfIn PDF document text
    • http://sobanurosu.22web.org/daxuvu.pdfIn PDF document text
    • http://tgesheff.xyz/berkshire_hathaway_letters_to_shareholders_2018_book0pq95.pdfIn PDF document text
    • http://biwiroxefamir.mywebcommunity.org/69301612199.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/jjjJhrk/noxelubotekim.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/H6hahiq/81287270027.pdfIn PDF document text
    • http://piguzipudoval.iblogger.org/convert_to_ms_word_file_free.pdfIn PDF document text
    • http://freshnatur.fun/49613215581y9l9d.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/PpPjf8e/grandmother_gifts_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/pawapoma/jgiBedt/85456663240.pdfIn PDF document text
    • http://gupirigugorixuf.sportsontheweb.net/electric_pressure_cooker_recipes_pinto_beans.pdfIn PDF document text
    • http://energierecrute-emplois.com/how_to_find_a_picture_of_someone_onlineuz4nw.pdfIn PDF document text
    • http://astropsychology.site/166743670287i21q.pdfIn PDF document text
    • https://cdn.sqhk.co/lojadisexudo/PjdjaQY/zarakofiselome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipanokule.onlinewebshop.net/pibuse.pdfIn PDF document text
    • http://wirirarosutuki.epizy.com/32918158412.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/taxmann_ca_foundation_books.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_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 13168 bytes
SHA-256: 560b19c82cb827ae836c230c2e337f906a2070026aa73a435e9ef23eb717c065
font_01_sfnt_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 5456 bytes
SHA-256: f960c752057e6804104edcab4950e861b9daddf74a6f07f1d5142ddb4f854d6f
font_02_sfnt_off00012f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 10232 bytes
SHA-256: d439d0a179da1754faa9bd70159c4a3c11af040fff9b60789d74bdf81f089128

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