Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a98fafaa1b61392…

MALICIOUS

PDF

73.7 KB Created: 2021-03-19 04:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c8b8b99ff025ba699e647eeb84c86288 SHA-1: 39d68a5aa976facd545185a9e020c19d1a4284bc SHA-256: 3a98fafaa1b613925783e5cbe1fc745305b40f6d8a97f74020acfdf04233756a
186 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classification and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'Ergo omni 360 front facing instructions', likely a pretext to disguise the malicious intent of redirecting users to potentially harmful websites.

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.
  • 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://fokemale.ru/aws?utm_term=ergo+omni+360+front+facing+instructions PDF link annotation
    • https://cdn.sqhk.co/kotoweraga/zC6ahbL/lixuninokepa.pdfIn PDF document text
    • https://lidobovinibun.weebly.com/uploads/1/3/4/8/134861857/db40d24b4bf.pdfIn PDF document text
    • http://kuliwajijet.22web.org/audit_report_format_2017.pdfIn PDF document text
    • https://gegovowazuravas.weebly.com/uploads/1/3/1/3/131398401/kavavozaku.pdfIn PDF document text
    • https://cdn.sqhk.co/nepofigiper/hfZBRs3/solozadarakugafasaki.pdfIn PDF document text
    • http://manirixibuwoko.iblogger.org/60145018680.pdfIn PDF document text
    • http://sanelobazigi.medianewsonline.com/waiting_for_godot_full_play.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/36625229390.pdfIn PDF document text
    • https://jonomivebotuw.weebly.com/uploads/1/3/4/6/134683751/suwosixitel.pdfIn PDF document text
    • http://vizazovabula.mywebcommunity.org/abundance_now_book.pdfIn PDF document text
    • http://xasekijig.mypressonline.com/pufovewexiwavarilidazev.pdfIn PDF document text
    • https://zepudelewow.weebly.com/uploads/1/3/2/6/132682561/donabodu.pdfIn PDF document text
    • https://luxowodadobib.weebly.com/uploads/1/3/5/3/135325591/8af03cda95b45f.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/aicFQja/writing_a_letter_to_a_friend_format.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/64713828868.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/what_does_like_water_for_chocolate_means.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zunebitalubale.rf.gd/antenna_and_wave_propagation_by_kd_prasad.pdfIn PDF document text
    • https://a2876ee3-c470-454a-91e2-e108d831033a.filesusr.com/ugd/e8dba5_3f912b4fa10343bbbb28f6b69ce80df1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/veburanaketubik.pdfIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_a1ba9dd7dcee499d9fbc0a7abf506479.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/wijukazix.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/centralised_form_of_government.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/esl_teacher_cover_letter_template.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_off0000e340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE340 5588 bytes
SHA-256: 6dd6b861721f2dc21f2c735cdf225639c4895017fd53a083182c94c6d89460e0
font_01_sfnt_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 10308 bytes
SHA-256: 418e345350d8aba06b6dfd96af281eb92109d2128f2257afadd41bcce2333538