Malicious PDF — malware analysis report

Static analysis result for SHA-256 1efc676c8f8fa302…

MALICIOUS

PDF

81.2 KB Created: 2021-06-06 04:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eb1b4652ee378227b537dfa7f0f242cf SHA-1: 2cde87a3d378a3e27dccd9a3f632783ccabd3774 SHA-256: 1efc676c8f8fa3029eec1dcb0c8ad269cdbaacaf8ec77f5fd5b49db1770b6246
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://golowaki.ru/123?utm_term=autocad+pdf+converter+software+free PDF link annotation
    • https://rediwikutine.weebly.com/uploads/1/3/4/0/134096605/7217675.pdfIn PDF document text
    • https://wubomedigupuda.weebly.com/uploads/1/3/4/6/134696881/9428571.pdfIn PDF document text
    • https://kapovisawok.weebly.com/uploads/1/3/4/6/134652754/loxizavomib.pdfIn PDF document text
    • https://viriparerari.weebly.com/uploads/1/3/5/9/135978168/179f59c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f31129-98db-4898-8d04-5e5a188e8636/gukuporula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ac4f39-de2a-4b85-89a5-a3894fa3f4c6/tarugig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e6e12f-5da8-414e-9efc-dcbf77003775/divijiwokekawulak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f32439-75aa-428d-9ccc-2b504f2798ce/what_laws_do_teachers_have_to_follow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f329f9b-b229-4516-b971-beb320c9ed6c/tolizimivurak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1863394f-78fa-4713-8a72-2a2cf5391e20/debaxulezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36c10f3-3eef-4a45-9baa-574b91cb54fd/xumodip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d3fc22-4b95-48dc-a729-7c48907f32c8/cronbach_alpha_symbol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b576e485-8d98-47c1-9b30-963a8c0db3cf/nutodamesabuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/532a0eb2-b909-4014-aeff-b637f6145d49/97758175385.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/w/file/fetch/144548355/secret_language_of_birthdays_november_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ac79741-b874-4d3d-88c0-c449847bb513/51000439306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c201b669-6857-4c28-a692-ac98743319a1/33104827181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea56f308-30bf-4676-a4ec-1946c2fda015/spider_man_comics_free_download_in_english.pdfIn PDF document text
    • http://figuduvimeti.pbworks.com/f/4279333296.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/contoh_judul_skripsi_akuntansi_pajak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7027c3fb-cad6-40d9-b406-bf8df77e8250/void_a_check_number_in_quickbooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7c7af4-e40f-4305-946e-c9bd35660615/vekirej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba3dedca-6ca3-4ae6-8bc7-9cd30b89bf9d/mexutowiwaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be8e1f80-c5bc-432a-b8c5-034a8647afca/nimaxunamexovutor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74304ebf-e3ce-4433-aa9c-3ecc5ceb094b/sodifumuxuzawuxegipimef.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/w/file/fetch/144522051/tidetemabudujewajuduloj.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/f/pop_slots_free_chips_twitter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 5256 bytes
SHA-256: 687ab04337cc94dfdd1a06e59ee6280f121bb63588dcbc5655b822eb577ab48f
font_01_sfnt_off000106dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DC 10368 bytes
SHA-256: 40c4d2e66e6c4a26f3714943be98d4bc017ed3efa42078e9b5c4488f4a53d0c0
font_02_sfnt_off00012ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC5 3040 bytes
SHA-256: 88799c23f077f2b7e4322e9f555fba8ee9cdf95b5dc60bc477266bc4ea40646f