Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5ee4026a2ee51b…

MALICIOUS

PDF

73.7 KB Created: 2021-02-25 15:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6ac8d9d85fe93367ee99550a14f175db SHA-1: c135543919b2172ec59d05104fbb1e902dda695a SHA-256: 8d5ee4026a2ee51bb4b34dd589fab8a32ab5d7a5e15b50f4aaf407fd4bdcf62b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, which is characteristic of a link farm used for SEO manipulation or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://jottigo.ru/aws?utm_term=another+way+to+describe+a+sunrise PDF link annotation
    • http://legendnat.space/jadavetapapexigilorrzrzs.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/ibidigz/rush_greatest_hits_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/wSicjim/jirugosatomijulisexetoj.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/reading_the_bible_in_120_days.pdfIn PDF document text
    • http://fabulouss.space/league_of_legends_adc_positioning_guide8dtk2.pdfIn PDF document text
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/zobugot-sinikujufefum-jelol-vimefigopesidu.pdfIn PDF document text
    • http://gusanod.22web.org/linux_centos_6._7_iso.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/egixT2j/background_video_recorder_android_github.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/69884634211.pdfIn PDF document text
    • https://vororesefuvemux.weebly.com/uploads/1/3/0/8/130813496/titujugu-sekatolamut-zebovavadobupeb-rotekizawa.pdfIn PDF document text
    • https://cdn.sqhk.co/tememagitapo/jfbgggi/zisovaxifubigozof.pdfIn PDF document text
    • https://cdn.sqhk.co/zarifabidit/8iighDA/boy_bmx_bike_20_inch_wheels.pdfIn PDF document text
    • https://vufaredagisab.weebly.com/uploads/1/3/4/5/134585575/libugofef-pufolanokuraned.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vudunebavibag.epizy.com/wexusoxunanonenoraro.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/7005451738.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/appendix_b_form.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/folazezogere.pdfIn PDF document text
    • http://kosener.epizy.com/quantitative_data_analysis_in_research_methodology.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_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 5316 bytes
SHA-256: aac6713286edbc04081d59a15e31cfbec9fe24925b783c9043391b9b7dd6cd28
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10584 bytes
SHA-256: 4b3dd85bab60f7c025f63cf4b5a1203b930034acb33e5bd0bdc301c16f41793d

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