Malicious PDF — malware analysis report

Static analysis result for SHA-256 0787c6499036de68…

MALICIOUS

PDF

77.4 KB Created: 2021-02-19 09:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4d055561aea99f50a5d3c79cc3fd626b SHA-1: b3a54748cfebf008f794bc048886aabb13f7e927 SHA-256: 0787c6499036de68369e86fcb8e9cf090d1fa35e094cf9878016f671c30bfd9a
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs, many of which point to disposable hosting and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack vector appears to be luring users to the `jottigo.ru` domain under the guise of educational content, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/wix?keyword=college+algebra+crash+course PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486033/normal_60119bf10bc8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5ffbd00e6f9ef.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/e3Ahhha/moduwiputupebosujod.pdfIn PDF document text
    • http://idealsit.fun/el_principito_y_la_rosa_te_amo_capitulozkr3z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6023f65b25b12.pdfIn PDF document text
    • http://bet-info.ru/how_to_set_a_marathon_wr30m_watchj717k.pdfIn PDF document text
    • http://monongzhlh.space/wozibefedajifunagtgoen.pdfIn PDF document text
    • https://cdn.sqhk.co/faresawuf/ggjjlij/power_media_player_for_dell_review.pdfIn PDF document text
    • http://gromstroy.com/kiridenomevovimodn9np.pdfIn PDF document text
    • http://opensoda.pro/vs_code_default_html_formatterhzxgo.pdfIn PDF document text
    • http://shoop-ft.ru/sheep_classing_definitionq6zx0.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/hhdd9ih/87254166136.pdfIn PDF document text
    • http://dixojele.22web.org/bhakta_prahlada_telugu_film.pdfIn PDF document text
    • http://wuvaviw.iblogger.org/premiere_pro_credits_template_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379221/normal_5ff4694c04227.pdfIn PDF document text
    • http://uscovidcharts.com/american_heart_association_bls_cpr_guidelinesv6n2r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rixedimuven.epizy.com/fantastic_beasts_and_where_to_find_them_4_casting_call.pdfIn PDF document text
    • http://tutedenomazul.epizy.com/midemaloziretit.pdfIn PDF document text
    • http://fusopub.rf.gd/19346423214.pdfIn PDF document text
    • http://womunek.rf.gd/verb_1_2_3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 4872 bytes
SHA-256: 9a597750b618ca13318d6fec9a44966c3d1a3532cb6eea94276c8b77eb36bdbc
font_01_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10408 bytes
SHA-256: 50795c5ad05b0014c5606542efcef653ad741cae70ad4209ca1b549edf798816
font_02_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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