Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a4f72d479a2a66…

MALICIOUS

PDF

81.8 KB Created: 2021-03-13 20:36:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 31964887784281f867085ff7d4d408f0 SHA-1: 7df8dc30e9897201c2520b4a04a052c523b0ff80 SHA-256: 35a4f72d479a2a66bc7faa9117ee631af19a6614a46a3ccf526e457c9e473369
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one critical heuristic identifying it as a PDF link farm. The primary malicious URL, https://soxebez.ru/strik?utm_term=formulas+geometria+espacial+pdf, is likely used to redirect users to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/strik?utm_term=formulas+geometria+espacial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446045/normal_601b8df568e25.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/jRfjcfT/78534327647.pdfIn PDF document text
    • https://cdn.sqhk.co/migawudewiw/8jeBDuL/enlighted_sensor_datasheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_601f04c4ca2fe.pdfIn PDF document text
    • https://cdn.sqhk.co/figotabam/EQy9yja/56038458910.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/eDigicw/riluxumirar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_60139176ee003.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_61970ad88fb6451d9cd4ede7d994b540.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/basomak.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_e24f3c79036a4cbc9fb8acd1909984db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokit/calligraphy_vector_free.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/gimela.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/jijotegubajabusuniz.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/1992_doj_ftc_horizontal_merger_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/apple_ipod_shuffle_2gb_mp3_player_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/vofanidopulotilija.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/najamoburigitu.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/template_banner_multi-_gaming.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/behavioral_questions_in_an_interview_and_answers.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_973769ae72c245fa94ae80e19842b1b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/template_cover_letter_nz.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_13be5e52a4a4472dacd2edc60471447e.pdf?index=trueIn PDF document text
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_8f6559ca415c499db49ca82be214b7c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/tuvabeneninevodijemene.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_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 5432 bytes
SHA-256: e0ec601d48961bb68aa725e12622c8877ed2318a64c317a4cd6d595f8904473d
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 14492 bytes
SHA-256: 221f47ddd1295d26e63839c1b86391ba36dd104f21f0cc27b663884325967832

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