Malicious PDF — malware analysis report

Static analysis result for SHA-256 932abe39f5baef87…

MALICIOUS

PDF

83.2 KB Created: 2021-04-05 02:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b21e4ea2666538b4cfeae2cf29ebacfe SHA-1: 4042dd0df829bf3ddf722c1b0542aded645d7d7a SHA-256: 932abe39f5baef873f57d7f6f942f94b926c87c1548169423ae8ed5d2dac19b0
176 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious or link-farmed websites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and the presence of many unknown reputation URLs strongly suggest this. Although no scripts were explicitly extracted, the 'PDF_MALFORMED_EXPLOIT_STREAM_LENGTH' heuristic and the ML classifier's high confidence score point to malicious active content within the PDF, likely designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://soxebez.ru/award?keyword=anestesia+raquidea+en+ni%25C3%25B1os+pdf PDF link annotation
    • https://zupuxugemewizo.weebly.com/uploads/1/3/4/3/134309945/keveb.pdfIn PDF document text
    • http://amandeepsadyora.com/gods_and_goddesses_of_ancient_egypt_and_what_they_representgv1ya.pdfIn PDF document text
    • https://fudiditinip.weebly.com/uploads/1/3/1/4/131453724/fece00c.pdfIn PDF document text
    • http://dipazekonowa.mypressonline.com/1444692636.pdfIn PDF document text
    • http://salonly.xyz/steel_modulus_of_elasticity_in_n_mm2o7lv6.pdfIn PDF document text
    • http://nelolizavulejuj.medianewsonline.com/exercise_present_simple_vs_present_continuous.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/vubal.pdfIn PDF document text
    • http://roman-holidays.shop/what_does_upward_mean_in_sciencennbtf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafixatoje.epizy.com/churidar_neck_designs_free.pdfIn PDF document text
    • http://nogamijabuwemi.rf.gd/acrylic_glass_sheet_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/tasetazorifisebunaguz.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/insanity_flyff_farming_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/belajar_photoshop_bagi_pemula.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/milwaukee_m18_radio_charger_wont_turn_on.pdfIn PDF document text
    • http://jiporeve.epizy.com/gebovunuvakebejebas.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/wedding_photoshop_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/36023098477.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/13159091914.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/jeripexadumotiralifofup.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/celoma_embrionario.pdfIn PDF document text
    • http://feliruxitekul.epizy.com/business_magazines.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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 5332 bytes
SHA-256: 8e10a802b4eeed33d09a1fe4191225bcd56aa8cc40e548f4212fa84c4716d518
font_01_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 2024 bytes
SHA-256: 5d59e80714f055d0e20d1c4ed594903f00ea25dd365ddc0e243c90ca16be52db
font_02_sfnt_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 11924 bytes
SHA-256: e01f7bcd9acfdd983918904fc284d86c239032927caa56ea3cc63d7c2848c0cc
font_03_sfnt_off00012707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 16392 bytes
SHA-256: e66abfbeddc1d19d92dcb25e98d0a5acfcfed5afa902c0cdbe1883ebc60d8997