Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf871e14271f15cf…

MALICIOUS

PDF

130.4 KB Created: 2021-02-24 23:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cc7f5c1cc2967c8b115362355aa89e2c SHA-1: b8f5bf32f899c2aeac1f55335d3fa5d285303eee SHA-256: cf871e14271f15cfd351561c16ae5c2c7a661b81db6b7ba123694f1fd1a192fb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9993

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=volume+of+composite+figures+worksheet+kuta PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385213/normal_5fdfd6797ddd9.pdfIn PDF document text
    • http://24goodstore.site/major_mayhem_2_free_downloadqerkg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_6032163d82008.pdfIn PDF document text
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/siguzubolejob.pdfIn PDF document text
    • http://edapog.online/64915823495h8b95.pdfIn PDF document text
    • http://vykupavto54.ru/letter_sounds_worksheets_kindergartenz2tl3.pdfIn PDF document text
    • http://retamos.mygamesonline.org/88703076329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451971/normal_600ccdf45e0e5.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/sefabe/17031938003.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/theory_and_problems_of_probability_and_statistics_schaums_outline_series.pdfIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/dudetapazivabalusudonog.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/zunibajujarelavigotegot.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/62046656042.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B7D 2872 bytes
SHA-256: a84fe8ccebaadaec26c68754ff56ec47e75d3d52b13675d8f9989f8d4dc65369
font_01_sfnt_off0001a5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5B7 5552 bytes
SHA-256: 73e1fd68af95b3ff87c0abcda44815e3039401a9082fa69553ae06aabeadc572
font_02_sfnt_off0001b88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B88D 13536 bytes
SHA-256: b40d62b4dbaa5da17cee1af0d5808a177b3c369af2545b005cb5d50a75731a88
font_03_sfnt_off0001e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6AE 16076 bytes
SHA-256: c33faafd911d2c4e8fea0807a017527063dea1be9a25b30e85ccf6f7667e82b6

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