Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7ab5bc646d828b…

MALICIOUS

PDF

83.1 KB Created: 2021-03-19 09:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 38d76172ea776ea1d1b2c8e1860dbdf2 SHA-1: e0115162d18b621ab3bddc950a8b726542121c63 SHA-256: 5c7ab5bc646d828bd8ac82ba38e75889c029633c2153bdbd56efd5dd8358a060
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of 'Tableau training free 90 days' in the document body and as a UTM parameter indicates a lure to attract users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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
  • 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://crophysi.ru/strik?utm_term=tableau+training+free+90+days In PDF document text
    • http://sdorovie-sustavi.xyz/2004_honda_odyssey_power_steering_fluid_leak4u3s0.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/452475.pdfIn PDF document text
    • https://tavefagizukog.weebly.com/uploads/1/3/0/7/130775361/subutenapira-kebifeletutofi-boxilededuv.pdfIn PDF document text
    • https://toruruxixe.weebly.com/uploads/1/3/4/6/134698343/3f6815130f92ea0.pdfIn PDF document text
    • https://lixavoje.weebly.com/uploads/1/3/0/9/130969842/97693e2f37e90b6.pdfIn PDF document text
    • https://pemugaladesav.weebly.com/uploads/1/3/5/3/135307247/9fe564a65e9280.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/xotumuru_sepinelunewim.pdfIn PDF document text
    • http://svoydvalend.xyz/fuxutunorogenelubijinezitxtl0j.pdfIn PDF document text
    • https://sesupukaxupasi.weebly.com/uploads/1/3/1/0/131070911/jizipazanire.pdfIn PDF document text
    • https://suretilan.weebly.com/uploads/1/3/0/7/130738944/c30dcc97389415.pdfIn PDF document text
    • https://lisoletabe.weebly.com/uploads/1/3/4/5/134511207/tekenulut_jajefigepesavu.pdfIn PDF document text
    • https://jajozopikikaju.weebly.com/uploads/1/3/4/3/134359408/latife-femenigalek-wazitadarenake-riwomabibupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a2edfa-9635-4dae-a333-27f5c1c0879d/how_to_install_a_new_clock_movement_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9bf5a88-89ee-418c-a92e-31aa76d5ffec/25197895282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdef34fc-276b-45c7-bed0-c6fb60fb1f6d/what_time_does_indian_market_open.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3087a55b-03d9-4e54-8d47-8b5f5b0b9448/rifexakudegizuzakemog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a71c65-fb1b-4de9-8a0e-e40142fe2f9e/42811352871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c73e160-c218-47e8-9b2b-ac4689fe969e/vutuvumebomutulot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6a3c27-a299-4d86-86b0-a35e4009823c/a_christmas_carol_movies_1984.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_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 5564 bytes
SHA-256: 5e3d9c47861383e79297fea4f113c184e72b1d96faa5761a994dab8374719e41
font_01_sfnt_off000117a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A2 11168 bytes
SHA-256: 1a17d648deffcb5136288c26b250988cb7f3d56f42018112c81e968183722fa6