Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8ee5bef9702675…

MALICIOUS

PDF

84.0 KB Created: 2021-01-24 17:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 703166080b2b8ddeabb2f2ba8c9a9660 SHA-1: c95b4a98bdadf05ca8bb1339bcd18ae534907dce SHA-256: 4e8ee5bef9702675b7a3a593f2dab977c881491cfb79d7d79430a85d79cf757b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files, indicating it functions as a link farm. Several heuristics confirm this, including 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. One URL, 'https://traffking.ru/wb?keyword=cloudflare%20outage%20map', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/wb?keyword=cloudflare%20outage%20map In PDF document text
    • http://rabota-plus.club/download_the_you_testament_the_2d_comingjaouh.pdfIn PDF document text
    • http://bigno.space/fluid_audio_visualizeri2ewp.pdfIn PDF document text
    • http://mestorating.ru/mega_anime_avatar_creator_games_dotfqtk.pdfIn PDF document text
    • https://wetebofi.weebly.com/uploads/1/3/1/6/131608016/gasuzopikes.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/kegaxig.pdfIn PDF document text
    • http://mignonette.space/cars_3_movie_poster3b9oj.pdfIn PDF document text
    • https://tiriwubesunadew.weebly.com/uploads/1/3/0/7/130739346/dopides-lubolumugu.pdfIn PDF document text
    • http://halfraire.xyz/wild_card_series_mlb_2020_standingse3ttv.pdfIn PDF document text
    • https://sanofawuvi.weebly.com/uploads/1/3/4/5/134588151/6612969.pdfIn PDF document text
    • https://sujujiga.weebly.com/uploads/1/3/1/3/131379538/kefodifabivudi-zepokam.pdfIn PDF document text
    • http://good-production11.site/cool_car_shifter_knobsw5kl3.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/3366451.pdfIn PDF document text
    • https://xewuligatojijow.weebly.com/uploads/1/3/5/3/135395235/kepelo.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/4363900.pdfIn PDF document text
    • http://skywonder.space/international_days_august_2020_ukrz9hm.pdfIn PDF document text
    • http://vipadminler.org/5031448361680e2i.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/zalisujezajaje/big_data_platform_architect.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/sbi_atm_card_application_form_offline.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/speed_er_for_windows_10.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 6588 bytes
SHA-256: fa72874b8c381873b432d3b5cea9ecddba20f04e8e1c9face7d560df1136061a
font_01_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 5088 bytes
SHA-256: 1327dd68ffb55ace111445d02536c69382ca5875ea340da626a5a8de498295d8
font_02_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 2196 bytes
SHA-256: 82763fcbfb34bd48129dfec6806877e3f41a440b2e822d4e090939f9eebcbd8c
font_03_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 12280 bytes
SHA-256: f711c3998fcc9cbb673188d2469e377a1512e583d57ee24664619017ae3a57ae
font_04_sfnt_off00012bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 16436 bytes
SHA-256: 405f035a6c0c661b9fd883f1b8799e3756528dcbd625c77faf43af007dbc398a