Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5d09f44747436d…

MALICIOUS

PDF

75.1 KB Created: 2021-02-26 23:44:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bdc675a5b6f56312125cd497f0666b27 SHA-1: 39a95f9bfdc91e84622b7a486dc30d9f98f9a8a2 SHA-256: 1a5d09f44747436d17215c3b5f882b70305704abe9e872993abe159ac2f2647d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm with invisible links, directing users to suspicious domains like 'lnstagram-support.live'. The document body contains garbled text, suggesting it's not intended for direct user reading but rather to obscure malicious links or exploit 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://bologen.ru/award?keyword=when+do+the+us+stock+markets+close+today PDF link annotation
    • http://lnstagram-support.live/mujofoliwopurotil6cij.pdfIn PDF document text
    • http://hyipinvest.site/pathfinder_psionics1juaz.pdfIn PDF document text
    • http://vilofanasupa.iblogger.org/bilegipok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_602167804cf5f.pdfIn PDF document text
    • http://copyright-infringement.business/zinalaredigerokx78n.pdfIn PDF document text
    • http://my-favshopg.online/71909496513mi2qy.pdfIn PDF document text
    • http://pinerapidsrr.com/ldr_sensor_in_proteus1acqx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460266/normal_5ff2343b1d66b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zanawolusebil.epizy.com/88063990720.pdfIn PDF document text
    • http://sotexazonilot.rf.gd/tugaxaratuloginuzenera.pdfIn PDF document text
    • http://vujurow.rf.gd/myers_briggs_type_indicator_career_test_free.pdfIn PDF document text
    • http://majoxokusixapav.epizy.com/dabofikaledip.pdfIn PDF document text
    • http://wolawozel.epizy.com/vedapuxitukawiwu.pdfIn PDF document text
    • http://gonuvatujuj.epizy.com/how_to_put_amazon_prime_on_twitch.pdfIn PDF document text
    • http://tibuwol.rf.gd/craftsman_60v_battery_charger_manual.pdfIn PDF document text
    • http://rotigolas.epizy.com/general_insurance_exam_questions_and_answers.pdfIn PDF document text
    • http://rujesuluxure.rf.gd/girozozosazumogofo.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_off0000e8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C2 5360 bytes
SHA-256: 12ce8abe03643a681429eb1b4644db2f0f9260037391885197aa362419cc8eaf
font_01_sfnt_off0000fae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE1 10800 bytes
SHA-256: 79a61a4546220e688e4a3adf28fd4208f0b8bc36bdfb23f3d217a405dd7de07a