Malicious PDF — malware analysis report

Static analysis result for SHA-256 9381a2e45094c3ed…

MALICIOUS

PDF

76.5 KB Created: 2021-05-09 07:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a0b702c37b30f0f65d44ce30c221cc02 SHA-1: b6d0aacdf5241ee8768d097033dd154b4cc1a5ce SHA-256: 9381a2e45094c3ed788dceab7938dfa87cec43483be42a8142c82c4edb1b0cc4
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm to distribute phishing lures or malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=minn+kota+ulterra+bt+80+us2+ip+60 PDF link annotation
    • http://towonededuv.medianewsonline.com/on_crime_and_punishment_cesare_beccaria.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/3321369.pdfIn PDF document text
    • http://fidesuwuranotif.getenjoyment.net/14237994263.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/lififij/molar_absorption_coefficient_equation.pdfIn PDF document text
    • http://zuwifipenabed.medianewsonline.com/8127337584.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/jjKGgcZ/john_gba_lite_pokemon_fire_red_trade.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/hbYicTV/fopebefewevodaxizinixi.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/gvRjey2/56377774410.pdfIn PDF document text
    • https://cdn.sqhk.co/fetogivaw/jhiSsif/pepajolejabut.pdfIn PDF document text
    • https://judumufef.weebly.com/uploads/1/3/0/7/130738812/e5ac6.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/hdSjhOi/handmade_diy_slime_simulator_apk.pdfIn PDF document text
    • https://kejedavozeve.weebly.com/uploads/1/3/1/4/131483662/kujunividemefejepowu.pdfIn PDF document text
    • https://wabobileminila.weebly.com/uploads/1/3/5/4/135400898/79ff00706984.pdfIn PDF document text
    • http://nuxipawuxodiwa.getenjoyment.net/xuzugizojoxubit.pdfIn PDF document text
    • https://zuvixane.weebly.com/uploads/1/3/0/9/130969636/4447325.pdfIn PDF document text
    • https://cdn.sqhk.co/nowazedadara/dTihFAW/fefolobifit.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumula/2iePfia/rotten_teeth_in_dogs_pictures.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/pubopelej/34133984966.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/image_to_cdr_converter_free.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/wuxizamekiwaje.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/82826581644.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/where_can_i_watch_the_art_of_racing_in_the_rain_online.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_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 5644 bytes
SHA-256: 893d24201ff30891eeecae6fc46ff3a77644924004d911a5ea52d528d440cb0a
font_01_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 12492 bytes
SHA-256: 8242de1ff0b00a74df01e9bfe033669f053581734dfacc195b4be2dda5d2d53e