Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9c086b3a222d5a…

MALICIOUS

PDF

85.3 KB Created: 2021-03-27 17:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 1acd6458ffc35ec64155675872578089 SHA-1: e80e63c2ff07180fa6d5d961e78e9ef328732377 SHA-256: 6c9c086b3a222d5a2cbece9247b8af4328da4ec4f7276b05f0c490d5ef3f65b4
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/award?keyword=ncert+chemistry+book+class+11+part+2+pdf PDF link annotation
    • https://rexanofodifedow.weebly.com/uploads/1/3/1/3/131378899/lerepo.pdfIn PDF document text
    • http://mklhhhh.space/41732374657hrxet.pdfIn PDF document text
    • https://titoduxelet.weebly.com/uploads/1/3/5/3/135399046/2812080.pdfIn PDF document text
    • https://nekejoravumow.weebly.com/uploads/1/3/4/3/134355852/5909152.pdfIn PDF document text
    • http://alkim.xyz/gledai_filmi_online_free_bg_audionw5el.pdfIn PDF document text
    • http://adv-workshop.site/enemy_gates_stealth_war_mod_apktbvf6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418000/normal_60073641d28d5.pdfIn PDF document text
    • https://numurivigafezu.weebly.com/uploads/1/3/4/3/134390613/9672069.pdfIn PDF document text
    • https://jawavovamote.weebly.com/uploads/1/3/4/7/134748122/xiziru-visuda-gosinovuga.pdfIn PDF document text
    • https://warodimaziwini.weebly.com/uploads/1/3/4/6/134611971/dopubuwerarek-mesetedutogin-pebowipexut.pdfIn PDF document text
    • http://kieverts.xyz/maparutujaxuvopejusixa6z3s3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404497/normal_5feea8f253a60.pdfIn PDF document text
    • http://alexsaf.ru/eliason_easy_swing_hinge_templateoinn6.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/2bfb28.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/51da9993-4a5e-4f6c-b6e9-a6462d32c883/9913643100.pdfIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_dd4e1ef5507e49d2acff35ead66272ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/80c62d82-eef1-4066-b8f8-547c25d0f50e/saduwuzekome.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_699bee3b54184e89b46e26d6c02695ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15ebae1-e89a-415e-a250-11a9a4bde9ae/the_sworn_book_of_honorius_read_online.pdfIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_8fa7b3a7ed5947caa82d6f14a0e1b3c9.pdf?index=trueIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_9c291cbd554b457abcde5aaba18d43a0.pdf?index=trueIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_4e81b8c0775448ba8dccb57a28ccff6b.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_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 5852 bytes
SHA-256: 8458758a43c4edfbbd4a6ba33d2905936e9dbcc2ff64d67148da115f7605194c
font_01_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 11544 bytes
SHA-256: 96937ce4a9011a04ac2119fc8115359ad6072442a68e55e90702f94f4b0fd705
font_02_sfnt_off00013a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A55 3260 bytes
SHA-256: a4368239f0d91ed332e626a2559f84da3277edf7efbaf1b266963a915635e769

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