Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85c506d25ed92f6…

MALICIOUS

PDF

82.6 KB Created: 2021-06-14 19:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: de7765d17bc7cbecb9d44bdcd4931de6 SHA-1: af00f5d2ecde3f7dbfea1ea9f50f7ebb7f7b2562 SHA-256: d85c506d25ed92f6d5dde91051f57b9121e7d00b1d7fdd88912e9a368cedc886
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crewmak.ru/pbw?utm_term=materia+medica+dioscorides+pdf PDF link annotation
    • https://jigerilo.weebly.com/uploads/1/3/4/7/134702464/sowodifoluji.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/9530f.pdfIn PDF document text
    • https://jedamebised.weebly.com/uploads/1/3/4/6/134651392/lawabonu.pdfIn PDF document text
    • https://biziremidawa.weebly.com/uploads/1/3/5/3/135397591/pojajukogex_nagamuwanoxek.pdfIn PDF document text
    • https://jasumiwadujavik.weebly.com/uploads/1/3/2/7/132741590/90510c817021419.pdfIn PDF document text
    • https://porojole.weebly.com/uploads/1/3/4/4/134462866/dazijuxofeseweku.pdfIn PDF document text
    • https://tabuwesajusa.weebly.com/uploads/1/3/1/8/131856124/waxowupepi-muniz.pdfIn PDF document text
    • https://jevavuxenexek.weebly.com/uploads/1/3/5/3/135351486/vofukel_mevawikebupujaf_fuvitotifozilo.pdfIn PDF document text
    • https://sesirolomozanu.weebly.com/uploads/1/3/2/7/132741009/687ec5c.pdfIn PDF document text
    • https://foreguguwikib.weebly.com/uploads/1/3/0/7/130775698/6694242.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wudiwiligis.pbworks.com/w/file/fetch/144567552/ethernet_cable_color_code_wikipedia.pdfIn PDF document text
    • http://bunemirudezo.pbworks.com/w/file/fetch/144673590/jebewuwe.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/f/41399411930.pdfIn PDF document text
    • http://wixudes.pbworks.com/f/ramenujonipepiwovure.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/najarokovutoberipus.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144415542/zekakazolopefodosakaledo.pdfIn PDF document text
    • http://tuxowojopugo.pbworks.com/f/sarva_deva_krutha_lakshmi_stotram_telugu_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be530f08-ddd4-44d8-b204-a565c152761d/the_norton_anthology_of_drama_shorter_third_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48bcab69-45cd-47c6-83e0-bd067a7c5a3f/lajovasiwilalurakululawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78c40fea-a590-4016-88c6-6396c2adc286/how_to_write_a_science_fair_discussion.pdfIn PDF document text
    • http://sokulus.pbworks.com/f/wakevemogow.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D7 5276 bytes
SHA-256: 3428a88898af5894feb1d02d6729376b5c252130f18accaacca93be4af191b2e
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 13444 bytes
SHA-256: 6447ac6d4d3705eb25d23c5246ec4b2248a1fb07e5514a7838eb0ce66b20139f
font_02_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449