Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dba27fe5c82c45…

MALICIOUS

PDF

121.0 KB Created: 2021-03-05 23:42:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f83b874e88f58ab4c819c85707fe3371 SHA-1: dd5acb4239b16d5f50ae3e6637d9700a5813e9ce SHA-256: c6dba27fe5c82c45e9ecbb707aab1d9c02c0413f57a1b6bc12759731d57c3d27
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/wix?keyword=free+steam+code+generator+no+survey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467589/normal_602e1dfbefedc.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/jaVYWhg/caramel_candy_apple_slices.pdfIn PDF document text
    • http://fukazab.mywebcommunity.org/let_us_create_man_in_our_image_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/sokavuwoz/jvGhhje/70176021018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494146/normal_6036da891c909.pdfIn PDF document text
    • https://molowusutet.weebly.com/uploads/1/3/1/3/131380828/laxotadovigivokusi.pdfIn PDF document text
    • https://wefupavoxed.weebly.com/uploads/1/3/2/6/132682659/vovake.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/Cjcwagj/2nd_birthday_cake_images_for_girl.pdfIn PDF document text
    • https://ragurukenawuxif.weebly.com/uploads/1/3/4/6/134667210/xikata-fizixe-fupuv-tagifim.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/zeralavigiwamezi.pdfIn PDF document text
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/parifedizitidi.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/what_size_carry_on_baggage_for_delta.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/pokemefizaguvitonejetebaz.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/hibjfib/buwuwepuneritopofox.pdfIn PDF document text
    • https://vawuwoteb.weebly.com/uploads/1/3/0/9/130969488/wetazifuloji-kajakix.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/67928e18-69a0-486a-aab9-a97f17b6b1fa/8272993506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba553606-d65d-42c6-9103-06c5b74fd523/what_material_is_a_stress_ball_made_out_of.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d68f75-bb3f-4fee-8fda-1e09af0f0bd9/divegemevulebajimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd4707c-49da-48be-982c-95f36e3ad7c8/is_percy_jackson_movies_on_disney_plus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50b57b36-c8ec-4862-8680-b5ad539e1599/6466444087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0a4e460-e815-4cba-89ed-30fb67c4798f/ninizojetorex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81eabe3-2847-45c7-b735-d89e330d8ab6/2005_honda_odyssey_sliding_door_troubleshooting.pdfIn PDF document text
    • http://kopolug.myartsonline.com/propiedades_mecnicas_de_los_materiales.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_off00018a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A52 5176 bytes
SHA-256: c1733096ce94cc8cdddffa03e189ec4311e1324891a24412531203f9ce39c2b7
font_01_sfnt_off00019bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BD1 13984 bytes
SHA-256: b32bb3fddbdc3e67553933811d46874ef5f63ed6342937a358482a07af3eab42
font_02_sfnt_off0001c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7F5 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c