Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc3e4d839bb5c01…

MALICIOUS

PDF

77.7 KB Created: 2021-03-12 06:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9ebaa9e49364a5e32c6cba4292d06cc6 SHA-1: c88a432d145b8da501db7098c7696929b04cf383 SHA-256: ddc3e4d839bb5c019791f8d81e745b074a1a550dc15dd4c58999ee155c510c5f
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized domains, suggesting a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a lure to a redirector URL, which is likely used to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=department+of+agrarian+reform+definition PDF link annotation
    • http://tuzojexis.mypressonline.com/pictionary_words_easy.pdfIn PDF document text
    • http://fabujisaw.mygamesonline.org/pedagogical_approaches_to_teaching_english.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/tekudorirogofeto.pdfIn PDF document text
    • https://sixagezox.weebly.com/uploads/1/3/1/6/131606695/1736452.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/Bcjfjh1/97574688874.pdfIn PDF document text
    • https://sanijala.weebly.com/uploads/1/3/4/8/134889677/fcecaffce5a9.pdfIn PDF document text
    • https://kixaxadamakike.weebly.com/uploads/1/3/0/7/130775249/mavapemuvilaxuzepozi.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/jfjiAji/shooting_stars_sound_effect_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/ibjiifI/bovuvirupisosafumope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mokixetat/curb_your_meme_music.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/petexotefodixajivug.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/diabetes_mellitus_guidelines_australia.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/gedapisotule.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/heat_stroke_management_guidelines.pdfIn PDF document text
    • http://pebomotixot.myartsonline.com/81269329319.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/tuzika.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/9209661345.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/73235492288.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/93977671723.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/48545347345.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/83312567575.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/modifiers_examples_with_answers.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_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 5148 bytes
SHA-256: e37fad8090a3cbbfe6edd015b2ea61441ac40c79edd2378adebe7d4e8e6f285d
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 16552 bytes
SHA-256: 2767e2fd8e61aea041866f028d289e0de4ce5871cf13392168e0c5040a709031

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