Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d9ec5b4d6149b7…

MALICIOUS

PDF

80.7 KB Created: 2021-02-14 11:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8ebbb1dec47250d46106b063d716a90b SHA-1: ace24c4eaa03de169e1aacc9456b516a4f0673e1 SHA-256: f1d9ec5b4d6149b702d9bb057be686a1e54b1fb2810dc5af68bceab65ea715ff
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://jottigo.ru/aws?utm_term=marketing+quarterly+report+sample PDF link annotation
    • http://rikaseligexodiz.22web.org/pectoralis_major_manual_muscle_test.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/nirawezakipol_jezomitizonuruv_wuliwawubufavu.pdfIn PDF document text
    • http://ita-talia.fun/lezokekejn56h.pdfIn PDF document text
    • http://jukavoluv.iblogger.org/speak_softly_love_piano.pdfIn PDF document text
    • https://zaluzukefajol.weebly.com/uploads/1/3/5/4/135400247/851488.pdfIn PDF document text
    • https://wevumofanefaso.weebly.com/uploads/1/3/5/9/135964816/f108deb77b5ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478134/normal_601d78d202fce.pdfIn PDF document text
    • http://shoop-fe.ru/madiganifejuveludehu77.pdfIn PDF document text
    • http://malitaludim.iblogger.org/facilitate_synonym_formal.pdfIn PDF document text
    • http://nasporte1.fun/diabetes_food_guidelines6aw12.pdfIn PDF document text
    • http://sevotapapi.22web.org/nixajizulazagovezer.pdfIn PDF document text
    • http://vejawezodasupax.22web.org/52523662988.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mezubivedoxida.epizy.com/rupalinafogasow.pdfIn PDF document text
    • http://pamubaj.epizy.com/57152357570.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/76602744758.pdfIn PDF document text
    • http://rigirulame.epizy.com/70699009274.pdfIn PDF document text
    • http://zenerunikojovo.epizy.com/admin_template_bootstrap_4_free.pdfIn PDF document text
    • http://tunivepusage.epizy.com/87859308038.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 5436 bytes
SHA-256: e656787130e4480884c775351d5972c16a270662f65915db0b8639ff74357399
font_01_sfnt_off0001110b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110B 10724 bytes
SHA-256: 29654bc8f2d945394fe82f5454180a1150118dac51453f644192511c92a689b5

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