Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f6c1f87c99214f…

MALICIOUS

PDF

75.8 KB Created: 2021-03-30 11:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bedf4fafbcf2b71fa823b19326f22a0b SHA-1: 2ad85e88b612ca9fff374503f13b754761e75260 SHA-256: b1f6c1f87c99214f7aa26b17ea75a3d14af56a2612efe011a200a4ee61abd546
156 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 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/123?utm_term=psychosocial+assessment+form+word+document PDF link annotation
    • https://foroziroxodom.weebly.com/uploads/1/3/4/6/134647192/fe977513.pdfIn PDF document text
    • http://jewlgems.com/24181673778fubn.pdfIn PDF document text
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/zidobeni-nonuxawoneno-retif-xojigofuxap.pdfIn PDF document text
    • http://pop-marketplace.ru/xukiparudoravor0sc0.pdfIn PDF document text
    • http://f13x.xyz/class_10_political_science_chapter_1_downloadimfal.pdfIn PDF document text
    • https://mopotepawo.weebly.com/uploads/1/3/0/7/130738720/7917138.pdfIn PDF document text
    • http://awpmode.com/80395126643pfi0i.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/7kPhahb/niwegipipuwiturabinefid.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/gfajgn2/bridal_wedding_dresses_online_shopping.pdfIn PDF document text
    • http://kvyovk.xyz/buffy_sheets_discount_codevdk1a.pdfIn PDF document text
    • https://rovisudaguxu.weebly.com/uploads/1/3/1/4/131438800/sipilifatim_kupox_tuvuzo_mixowe.pdfIn PDF document text
    • https://cdn.sqhk.co/filemowa/ygihcib/13643815021.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/adding_variables_with_exponents_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/gebotaretimabiteti.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/acrylic_colour_mixing_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/adverbs_exercises_for_class_5.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/firex_smoke_alarm_120-538b_beeping.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_e45f5ff8fe00453299c117558958e3c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juduk/99649145462.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_3a7a3f5b80574776a8601404833df47a.pdf?index=trueIn PDF document text
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_0374109591894bfcbaa66543fd76812d.pdf?index=trueIn PDF document text
    • https://bea00909-aa88-4d38-ac88-e56db460b486.filesusr.com/ugd/923104_632ae199536a4bccb45da6b4db53a5f9.pdf?index=trueIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_7cf5cc9030a14919ae63d4ec28ce51b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixanarer/anti_terrorism_training_post_test_answers.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 5456 bytes
SHA-256: d3365a1d41830f01d0512f165cc22404817b696b4e9f3c70ef0cacc05b7f45f0
font_01_sfnt_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 10820 bytes
SHA-256: fc4a3f2f6cf05e8b9ce4775f6c40dcfed55f22f287162782edc1a866c3c6f669

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