Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffead10d03e7b7f7…

MALICIOUS

PDF

75.8 KB Created: 2021-03-18 12:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fa2def09ce565dcc8e2d049d0c2f37c4 SHA-1: 13c66d9b2a2667862a345923361fd7308265c9f7 SHA-256: ffead10d03e7b7f7f00e1acc7e02ab13b8a538416141a5b5a82ff14c0e9e3eed
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/123?utm_term=centos+6.+4+iso+image+free PDF link annotation
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/6599420.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/igje7i5/car_crash_driving_simulator.pdfIn PDF document text
    • https://voselorijovun.weebly.com/uploads/1/3/4/0/134041736/142449.pdfIn PDF document text
    • https://cdn.sqhk.co/novupezezis/igOwLij/boyfriend_s_parents_don_t_talk_to_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/SOIoYhc/4476318072.pdfIn PDF document text
    • https://cdn.sqhk.co/potonefamuve/2idTfG0/35535192973.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/ponipisalexemeruzigerulaz.pdfIn PDF document text
    • https://nuzoligul.weebly.com/uploads/1/3/3/9/133997434/1498865937dc.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzomowa/drawujf/ultimate_omega_d3_reviews.pdfIn PDF document text
    • https://samojosaletope.weebly.com/uploads/1/3/4/0/134017273/7253859.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/ONvu3jd/10175334143.pdfIn PDF document text
    • https://cdn.sqhk.co/gewewoturila/ghIMC8G/weather_live_oak_fl.pdfIn PDF document text
    • http://zukesijinizik.mywebcommunity.org/cancer_statistics_worldwide.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwuwoki/gzsHrx6/clue_cells_present_in_urine.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/hjAidhd/14645693245.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/hdsnFhc/penabipukukesarela.pdfIn PDF document text
    • https://latimemoniborij.weebly.com/uploads/1/3/1/4/131437487/8299525.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/mexesazaxasa/how_many_sweet_potatoes_make_3_pounds.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/popsicle_stick_model_house_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/93289406009.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/how_to_attach_microphone_to_camera.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/agronomie_definition.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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 5236 bytes
SHA-256: 9ce41d5992e4911f84ae94836ab0609c4946c754b280671c4b7daf70c1946742
font_01_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 12020 bytes
SHA-256: bb4c8bb39a0e2c7671249e271f909c9e4b0f689a78220e79a75bf727d73000dd