Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8636e512b8c3d8b…

MALICIOUS

PDF

79.0 KB Created: 2021-03-19 17:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 45e9c5ab62cfab99e3864d6835e5de31 SHA-1: ee5fcda5c726ddffdfca25344192f8a6934fd96e SHA-256: b8636e512b8c3d8b59fbfa21b7a242553424bef850618b97571f527a0dc2957c
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, with one external URI pointing to 'https://nipisod.ru/123?utm_term=lonely+screen++ipad'. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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 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://nipisod.ru/123?utm_term=lonely+screen++ipad PDF link annotation
    • http://kofojoxake.mygamesonline.org/lawurebabotilejadujivela.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/4d037.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/e8f96716.pdfIn PDF document text
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/7853327.pdfIn PDF document text
    • http://doucheapp.xyz/can_2_letter_words_be_used_in_scrabble77ssr.pdfIn PDF document text
    • https://cdn.sqhk.co/gabamulijawe/ih3ibse/36584079153.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/gotusafukadixafirep.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/14003304873.pdfIn PDF document text
    • http://osthondroz.com/vegajoduze4c82y.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/limuzokedixamarone.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/bixanatanagutewijuzarokik.pdfIn PDF document text
    • https://kaxobemux.weebly.com/uploads/1/3/4/6/134676595/d71c69e4a.pdfIn PDF document text
    • https://cdn.sqhk.co/kugeturo/cieKhdK/download_train_track_pictures.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/the_ripple_effect_book.pdfIn PDF document text
    • https://cdn.sqhk.co/gibebomesani/iggcWo0/82167430846.pdfIn PDF document text
    • https://fokifukamanur.weebly.com/uploads/1/3/0/8/130874497/606626aa7c4e4.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/ifihggh/garden_of_life_digestive_enzymes_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • http://igbusinessabouthelp.com/ubnt_loco_m2_olxyh7d4.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
    • http://kikanelomer.onlinewebshop.net/patepokit.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/xusobikuwinep.pdfIn PDF document text
    • http://taberadajip.atwebpages.com/washington_gas_credit_union_login.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/adolfo_bioy_casares_poemas.pdfIn PDF document text
    • http://wemaxoseni.myartsonline.com/28796365502.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/athlean_xero_download.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/fast_food_drawing_images.pdfIn PDF document text
    • http://rosevasejila.myartsonline.com/how_to_reset_magic_chef_portable_ice_maker.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_off0000e97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97F 4816 bytes
SHA-256: 6367502e1ccc287c717387db1ef300e28b30e0c3523be0ca47518945df8ce006
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 11372 bytes
SHA-256: 97442cf32ffe314e93e8e5aa72bb1e6c8cec9fdc65402a133ee8f900ba46b854
font_02_sfnt_off00011ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA8 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e