Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e3a4d609598e12…

MALICIOUS

PDF

80.8 KB Created: 2021-03-20 08:29:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 073ef52f06296fa74f122f3bcf13352b SHA-1: 90a49463cedd9400e00cf4ca2dc5e7b4dbaecbda SHA-256: c7e3a4d609598e12ff55e385762ae2b4cd70ff368d06b04d97f000bba5ed78b0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/123?utm_term=absolutismo+na+fran%25C3%25A7a+pdf PDF link annotation
    • https://cdn.sqhk.co/vefapatape/qREgi4z/vast_tv_channels.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/idiiZU0/sagisuberubaverat.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/XJ0zOjc/dunodaxonavuf.pdfIn PDF document text
    • https://cdn.sqhk.co/xivomojuf/Fhb9jfF/60412432427.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/gjpjat7/26200434567.pdfIn PDF document text
    • https://cdn.sqhk.co/gojelonub/ercjgie/airbnb._com_host_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/webaxepibi/gOifrie/due_diligence_letter_template.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/genedesowul/zokanuloxukajolaxizow.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/words_to_describe_touching_something.pdfIn PDF document text
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_4619c77aaadb44bfb3ef4e00b767cd3e.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_b34bc9b5b7de41c2b7da3aab4f7e8337.pdf?index=trueIn PDF document text
    • https://a19d597f-2220-41b3-9459-688249e8a20b.filesusr.com/ugd/f19f53_40f760d8c78645449224a8c23fd5c407.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/40778449669.pdfIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_ba16645874184bc18fef2c5accfaa96b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/wow_hellscream_s_reach_rep_guide.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_10bebf0b481046709d28da0ee88e9993.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_7adc6b89fc5740c0907415c96cb65ecc.pdf?index=trueIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_9902fab820f54f47a54ed586b4586353.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gezetega/lokdhun_punjabi_movie_rupinder_gandhi_2.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/lutifaf.pdfIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_4391b191737d4bc0a8cccffa5f2ab0ba.pdf?index=trueIn 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_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 5500 bytes
SHA-256: 1d19528c1e49b01f246f000bc60d6463bb2251c948a1e9cfe7e45f954e108780
font_01_sfnt_off00010d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D76 12752 bytes
SHA-256: 18594c57830906a13dbffa3aff2aeeed08d1cbd89661796d4e32c388b91b2f11