Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb6fa4fde28cba7…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 22:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1838495cec567d9a9d25c1db5c5ac9bd SHA-1: 343987fe20563c8417ec2f8b58255fdccc87cf2c SHA-256: 3bb6fa4fde28cba75d62b0acafae5d6a5272ed1d2cde41a5417dbb7745b05cd2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to redirect users to potentially malicious websites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=que+hace+un+jefe+de+produccion+en+una+empresa PDF link annotation
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/wigodilive_pisuwir_bevariviz_dodolafimena.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/luxigekusaxazomirowotelafcnuo.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/what_is_the_great_pyramid_made_out_of.pdfIn PDF document text
    • http://aromaita.space/20771185691fy491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460042/normal_601c5d86e41ad.pdfIn PDF document text
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/6889206.pdfIn PDF document text
    • https://refaxoke.weebly.com/uploads/1/3/4/6/134602084/971449.pdfIn PDF document text
    • http://idealica-uficiale.website/five_night_freddy_song_4nwcjw.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/4af37.pdfIn PDF document text
    • https://marevesebogu.weebly.com/uploads/1/3/0/8/130813877/tidofagivovo.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/what_type_of_trans_fluid_for_chevy.pdfIn PDF document text
    • http://8gusevshop.website/giving_directions_exercises_with_answersh888d.pdfIn PDF document text
    • http://denizan.com/york_furnace_ignitor_near_metk6m4.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/exerccio_aerbio_e_anaerbio.pdfIn PDF document text
    • http://spindlndou.space/wenogofufarte401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_60497a94553d4.pdfIn PDF document text
    • http://wisecredit.info/arkansas_dmv_study_guide_2020sftbr.pdfIn PDF document text
    • http://pss77.ru/after_book_chapter_67_summarykrwuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_6038b96ef027e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fojosotum.myartsonline.com/algorithmique_exercices_corrigs_gratuit.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_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 5500 bytes
SHA-256: 0b5013db1ba3736cd3e919083dc4a2558fecefb3bb70c56c08f28bb3500747b8
font_01_sfnt_off00010671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10671 11340 bytes
SHA-256: dab0385bfffbc12c3ce5b26caab48beeac25c3a4b8e310fe6035c61a05048b3c

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