Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb5adf8323265a0…

MALICIOUS

PDF

81.4 KB Created: 2021-05-26 07:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d7d118edf9e4a7e81222ac74e5f0d4af SHA-1: 2d9beb76dad4e6975f1f7f4007e917c7d80a33d9 SHA-256: 5cb5adf8323265a000633a608be8f34de50f70318eb76945985c04bd9fc856f0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to S3 buckets, suggesting a link farm or SEO poisoning attempt. One primary URL, 'https://pelibifir.ru/strik?utm_term=punctuation+marks+worksheets+grade+7', is flagged as suspicious. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and link to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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/strik?utm_term=punctuation+marks+worksheets+grade+7 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484997/normal_603613c3340b3.pdfIn PDF document text
    • https://wivovisewisapu.weebly.com/uploads/1/3/5/9/135963584/motilogezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389095/normal_5fdd6a4785f66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5fced316539b2.pdfIn PDF document text
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/8271984713a67.pdfIn PDF document text
    • https://jupimoxojufe.weebly.com/uploads/1/3/4/8/134860775/sarolewu.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/muxojapuwe_malogixaju_daxasewimu_ketibadoxasa.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/kewuxejikiwe/how_to_make_stolen_horse_yours_rdr2.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/simple_present_tense_intermediate_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/74740605265.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/map_of_asu_phoenix_campus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c540c40-a0db-42f7-b0fe-f0fe9252314d/81694238839.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/35079540503.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/navien_npe-240a_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b8b5b40-fecd-4234-8876-c46886d195be/do_horses_die_from_broken_legs.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/romijejok.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/vugar.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/plural_of_irregular_nouns_worksheet_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/sfma_top_tier_score_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f58628-cf68-4823-9762-f5408af5bb09/chronicles_of_narnia_prince_caspian_mouse.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/peavey_classic_30_reverb_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/davowevitud.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/44957228710.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/what_legislation_did_the_care_act_replace.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/charities_regulator_annual_report.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_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 5556 bytes
SHA-256: d4b6c098aff4e1408b79f5456e5915013c03cfc4edc259033499198999f410a8
font_01_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 10996 bytes
SHA-256: b0593871ed13015b09415efdb05319b0cedccad06065c085611f15d168ca4c32

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