Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab828d7f5555cad2…

MALICIOUS

PDF

115.7 KB Created: 2021-03-12 02:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0abb5f1f533473084bc1c7a8118e87d2 SHA-1: 5fdb93315c98d234fedab18f660c11b8ab0e60ba SHA-256: ab828d7f5555cad28f6fbf39f4d1791401e5d02ca1ca14644fc8da63b2569603
186 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/123?utm_term=a+cappella+songbook+pdf PDF link annotation
    • http://lyudi23.ru/jibezi8msni.pdfIn PDF document text
    • http://formverifiedbadge.com/frauscher_axle_counter_manualuoqza.pdfIn PDF document text
    • https://radixukawatezod.weebly.com/uploads/1/3/4/6/134645496/pavajedirowifime.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/kanazeze.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/33728692385iczpv.pdfIn PDF document text
    • https://degevibuv.weebly.com/uploads/1/3/5/3/135316410/1241040.pdfIn PDF document text
    • http://sputnews.com/how_to_use_ultra_eliminex_detox_drinkg19ws.pdfIn PDF document text
    • http://tiktoktop.design/12718411718nwyup.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/zagezirira_tawug.pdfIn PDF document text
    • https://xamoxuwubedus.weebly.com/uploads/1/3/2/8/132814415/61991c.pdfIn PDF document text
    • http://supermagazforsale1.xyz/how_to_calculate_maximum_allowable_stressarsyh.pdfIn PDF document text
    • https://bupuvebawa.weebly.com/uploads/1/3/2/7/132740405/993d6d77fbc.pdfIn PDF document text
    • http://site-shop.xyz/25665550364fsqb8.pdfIn PDF document text
    • https://fujazilumekopel.weebly.com/uploads/1/3/2/6/132681311/3655772.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/4ba70d6c-8c29-4ed7-861f-b64c70efadc4/vibixuko.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/alimentary_pharmacology_therapeutics_author_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d43fe4e-bf1f-4279-825a-3a9403fd78e8/dumirifapavarurerelaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/792f410f-9509-4c7e-bd19-4baac7048bf9/34831578914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107c6d6e-8099-4bfd-9c1a-26f7ffb91e8a/whirlpool_washer_dryer_combo_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2070e922-ac6f-43ce-b8ee-d20741abfba7/the_birds_daphne_du_maurier.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/new_hd_movie_site_2019.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_off00018907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18907 5420 bytes
SHA-256: 054a44333f42728e8d91f1a93d9c71c25420b0fc538de6ac8d813af15f866cb0
font_01_sfnt_off00019b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B89 11016 bytes
SHA-256: 1a08c9ae5627196263fdb3c3fc86e075fb48731a448eb9f895fcca982d8cbec8