Malicious PDF — malware analysis report

Static analysis result for SHA-256 0750569a7e418c10…

MALICIOUS

PDF

81.8 KB Created: 2021-02-14 21:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9906a731469459954785bf41a849a52 SHA-1: 5c4825f4f974635088f2ff33370f19add924bbf0 SHA-256: 0750569a7e418c107b604b6b5ee4aa1e8f6115f561949543153cfc8161f72855
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and lead to redirectors, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/wix?keyword=massachusetts+driver%2527s+manual+in+arabic PDF link annotation
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/lukaruragemog-zudenapo-balexo-rujanutinilu.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/La3gghi/recarga_nauta_wifi_en_cuba_fonoma.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/ebyoLij/walkthrough_for_human_fall_flat_latest_version_apkpure.pdfIn PDF document text
    • http://gonugotez.22web.org/71960431529.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/6jgidz2/xutudilarizelazal.pdfIn PDF document text
    • https://cdn.sqhk.co/besuduxikuvo/gGsihyF/life_is_strange_2_characters_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/75yjfp8/dallas_stars_hockey_team_roster.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/jdNphgo/lesson_plan_templates_for_spanish_teachers.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/4Gvhad8/gugitavemebadesij.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/N1hjhaH/32622273888.pdfIn PDF document text
    • https://vaxinukosiju.weebly.com/uploads/1/3/4/6/134625250/df8dce2ce03bb04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/gazitif/detaxej.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/application_form_for_employment.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/jufiterodexekavi.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/intelligent_business_pre-_intermediate_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/zututobapukavumizexugi.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/vekagos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC914 4160 bytes
SHA-256: f8f80bf4025d9a3a5163f9446f54aa7d0eb52bb0f120f9f919ca3e53a85eb961
font_01_sfnt_off0000d7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D1 5416 bytes
SHA-256: 5a66048b14e9adeb9d506c1f1d2ad34022493f8f0ebc6044983ea49fbc91f5d9
font_02_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 10680 bytes
SHA-256: a889729720dc3585f0f551d75d4a60027608edc546d09c8e11fb9812d98febea
font_03_sfnt_off00010eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEE 17520 bytes
SHA-256: 5e5ca2504e5f8dfc6e77bc8912aa322eeeb6edacf9d37b8d0d35d3d1791f7a0a
font_04_sfnt_off0001290c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290C 4084 bytes
SHA-256: 48d17217655ac33c2fe33fbfdc502945369135f2a735b0237c30fef5344a3136