Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e28f7405aab93a5…

MALICIOUS

PDF

71.4 KB Created: 2021-02-18 10:32:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c26cbb4dcc157bffacce13688a007abd SHA-1: 5869ad971e5ac6e3c54ebb35e65fb6a14833536c SHA-256: 6e28f7405aab93a535dc445180b8c072334d4e56b7880baf66aba034f3b90dc1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/wix?keyword=vc+s10685%252Fp+c3 PDF link annotation
    • https://baseparefawufif.weebly.com/uploads/1/3/1/4/131453046/vesejaradenad.pdfIn PDF document text
    • http://twitter-center.com/ranewuf92bfc.pdfIn PDF document text
    • http://tehnotop.space/pasunowoditogiyceje.pdfIn PDF document text
    • https://mivebomuponi.weebly.com/uploads/1/3/1/3/131398008/jobiw.pdfIn PDF document text
    • https://xajimago.weebly.com/uploads/1/3/0/8/130813364/jaxidamilamiwuj.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/66135.pdfIn PDF document text
    • https://lewovabarififu.weebly.com/uploads/1/3/1/4/131453312/mepemipepupi.pdfIn PDF document text
    • http://jotusuwes.iblogger.org/54474939445.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/602967.pdfIn PDF document text
    • https://javagakikidubat.weebly.com/uploads/1/3/0/9/130969576/nugamenoremew.pdfIn PDF document text
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/zonudivo_xesabasidur_mozetev_xajunixopolov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zadizufosa.rf.gd/13132454235.pdfIn PDF document text
    • http://fasilew.epizy.com/hpv_treatment_guidelines_2017.pdfIn PDF document text
    • http://vurorevebosexu.rf.gd/british_council_ielts_books_free.pdfIn PDF document text
    • http://xuwuxubemepimox.rf.gd/xekuwakawizaruvovizeg.pdfIn PDF document text
    • https://s3.amazonaws.com/lawakux/99350203047.pdfIn PDF document text
    • http://bilunijo.epizy.com/adjectives_and_adverbs_worksheet_year_2.pdfIn PDF document text
    • http://sulosuduvemog.epizy.com/baseball_field_position_roster_template.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_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 5420 bytes
SHA-256: 9ecf3d277756d6452345a0751896d14c02660ada324fda6857a83c766f35c584
font_01_sfnt_off0000ed74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED74 10520 bytes
SHA-256: 6bb8db0ad5160504b7ae081fb7a935d868bba13860d4b6bc1418b87a3114276d

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