Malicious PDF — malware analysis report

Static analysis result for SHA-256 b541f090d3a409e0…

MALICIOUS

PDF

140.5 KB Created: 2021-03-19 09:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e1062370e6f54ac1977794963e78136c SHA-1: a3e45a2d06300590e0ed1bd46c0b281da4752a4c SHA-256: b541f090d3a409e09bd566155a94fcba3d47d4a021239f556929b310004c6fd7
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=profusion+ceramic+heater+reviews In PDF document text
    • https://bixuduserar.weebly.com/uploads/1/3/4/8/134861961/2956094.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/69743110815.pdfIn PDF document text
    • http://gugibugud.mygamesonline.org/3657267851.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/forever_ukulele_chords_kari_jobe.pdfIn PDF document text
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/worajuwegikubudafej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423715/normal_60204b9f9806b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_6046292b8d1c9.pdfIn PDF document text
    • http://pornbustyvids.com/kidizujefeturol3pp8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_60395ad6d1867.pdfIn PDF document text
    • https://pafegesufo.weebly.com/uploads/1/3/4/7/134719460/3b060002.pdfIn PDF document text
    • http://buloshnaya.site/hockey_manager_2020_pcpbhhp.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
    • https://s3.amazonaws.com/xupizewuxere/quadratic_inequalities_gcse_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/4004328204.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/ecg_lectura.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/ek_baar_song.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/new_bongo_music_video.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/vupegoniwajujenemapematu.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/literary_elements_of_hamlet.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/chloroform_spirit_function.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_off0001d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D969 5124 bytes
SHA-256: afbd48f79baa80e3408d2040ea27067ec7671230f2a646f361c6cb918898cbdf
font_01_sfnt_off0001eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAB1 13692 bytes
SHA-256: 1738160c20a962ba52c8be5477b349b71f0588e5c2b4570e376368ae7a829aa2
font_02_sfnt_off0002160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2160F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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