Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e9c3fb58e79938…

MALICIOUS

PDF

71.1 KB Created: 2021-02-17 04:20:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2443b941316ab19ade01cdd2856a9439 SHA-1: 97a42eee0a74bbc08621b4732a48c24bc990e8fd SHA-256: 27e9c3fb58e79938551cccd8d62fadf8b1d45f0e7e31fef71a9482b561c9ffe6
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 0.9997

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://crophysi.ru/strik?utm_term=personal+balanced+scorecard+definition PDF link annotation
    • http://premial.su/mthfr_folic_acid_build_upcltcn.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/world_clicker_idle_clickern1fr5.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/djbjijg/lugewobebuvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404975/normal_5fefe4a910316.pdfIn PDF document text
    • http://reawont.online/17551044750kzg0.pdfIn PDF document text
    • http://srakan.space/sades_sa-901_driverd7s2x.pdfIn PDF document text
    • https://cdn.sqhk.co/jifegusewe/jahejfA/free_robux_loto_2020_online.pdfIn PDF document text
    • http://italywom.space/improving_vocabulary_skills_answer_key_chapter_4f0eno.pdfIn PDF document text
    • https://cdn.sqhk.co/savageven/v1bifa9/dancing_with_the_stars_ireland_2020_wiki.pdfIn PDF document text
    • http://axecheat6.xyz/90449902284slg7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5fe089e3e2f8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_5fd1d73189527.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nifopufu.epizy.com/from_facebook_high_quality.pdfIn PDF document text
    • http://nixitomo.rf.gd/orbiting_the_giant_hairball_kindle.pdfIn PDF document text
    • http://turojupa.epizy.com/bbc_newspaper_report.pdfIn PDF document text
    • http://juwemijawikipo.epizy.com/antivirus_avast_android_apk.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_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 5156 bytes
SHA-256: 7d72dd35605a15b6c0016f7f7050b2cbaa69898415255642afb2f46d2eb37b5a
font_01_sfnt_off0000eba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA9 10444 bytes
SHA-256: 5f0e8f844dae2499344a3388a0707259231b6d8e3992086f4e36408a6e0ad46d

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