Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6fc4694b794dc2…

MALICIOUS

PDF

85.5 KB Created: 2021-04-07 22:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dcc16df0074d5ab3a3a02312cd2ee5f6 SHA-1: 563ace9ed8e7e2cdcbf0219eea8fc86eb94b9adc SHA-256: ba6fc4694b794dc2a574e50b44b3486a222d71e7ced32d2831233d395d41ff59
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 0.9997

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://crophysi.ru/strik?utm_term=how+to+get+rid+of+pimples+fast+at+home+overnight PDF link annotation
    • https://pazodozonevaken.weebly.com/uploads/1/3/4/6/134606284/2292729.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/kaligunebelogaroxibigex.pdfIn PDF document text
    • http://francobusiness.com/554272815364dxwh.pdfIn PDF document text
    • http://bestcreditcheck.info/flysky_fs_i6_rx_battery_setupdnoy3.pdfIn PDF document text
    • http://digtalcaliper09.xyz/vuwejagizataweleziro566i6.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/how_to_take_apart_lg_top_load_washing_machinebxdvl.pdfIn PDF document text
    • https://likuwamagu.weebly.com/uploads/1/3/4/8/134899286/8edb36e1d3ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b05cecef-0aff-4fed-834f-6a1ed976c00b/which_dyson_v11_is_better.pdfIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_697e946f9198489394d23f659bbd816d.pdf?index=trueIn PDF document text
    • https://b18ac5c8-c825-4c59-a0a1-290c879ce4f6.filesusr.com/ugd/1a0fde_5fc5aa2c94fe48478a7975e22288a36d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/chirutha_songs_teluguwap._net.pdfIn PDF document text
    • http://kikukuvikato.myartsonline.com/78900051124.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_efd19bf54ca745a7b0fb28ccb4b7b748.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b208b1-aaf3-460d-a526-37ece1d72dcb/mcg_a_mg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79046b88-2ec2-47cb-9409-e1981d20f2a6/82380199311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01d3ac81-d833-469c-877d-a6e5e2b94684/what_is_a_plural_possessive_noun_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed28e091-fb66-46c1-a69d-f176fa5f7642/design_and_control_of_concrete_mixtures_16th_edition_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/james_patterson_books_list_by_date.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_b2233a6066fb48d9a34dd8a5b303253b.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_5b5c348c86bc413bae24d345dc42b80e.pdf?index=trueIn 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_off000101e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E4 5356 bytes
SHA-256: a67521cd21fed3bcdcf31c68a53ffe5b4c962c92c0b3e20523fe15265bcc62b1
font_01_sfnt_off00011407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 11300 bytes
SHA-256: cd4d9cdb78589aeef512539f753e071a0a85586924d952ee00d7957ed1869b76
font_02_sfnt_off00013a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3