Malicious PDF — malware analysis report

Static analysis result for SHA-256 2154381aff15b884…

MALICIOUS

PDF

85.3 KB Created: 2021-02-25 09:58:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2d07368006186123babbbccb86c94069 SHA-1: c37276b61ad1fa5029c11f9851c29dd3d6e30a6e SHA-256: 2154381aff15b88429d73b9de382bca004813b46aaa7d675ec5d49f1fae44dbe
304 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous embedded URLs that redirect to various websites, some hosted on disposable domains. The document's content and structure strongly suggest a phishing or scam attempt, aiming to trick users into visiting malicious sites by posing as a resource for improving listening skills. The presence of a malicious redirector link and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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://crophysi.ru/123?utm_term=how+to+improve+listening+skills+exercises In PDF document text
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/xomix.pdfIn PDF document text
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/masigobetefod-dadip-jidija-xepojojevogenem.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/0ecb2d455032cf.pdfIn PDF document text
    • https://kedigijolaga.weebly.com/uploads/1/3/4/3/134331451/pewomovoragitupusag.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/song_of_myself_10.pdfIn PDF document text
    • http://balifruit.com/justin_bieber_sorry_video_dancedsjne.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/a31b78cb.pdfIn PDF document text
    • https://teputire.weebly.com/uploads/1/3/0/8/130813428/6858075.pdfIn PDF document text
    • http://saxobupazes.sportsontheweb.net/what_is_the_meaning_of_the_word_dialectical_materialism.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/40956752255.pdfIn PDF document text
    • http://gnfcns.info/35977154674edv59.pdfIn PDF document text
    • https://kajubogoxin.weebly.com/uploads/1/3/0/9/130969430/181b713411.pdfIn PDF document text
    • https://serudifatu.weebly.com/uploads/1/3/5/3/135324897/kidadisewamavus_rogorebu_sisixi_dugunor.pdfIn PDF document text
    • http://arfesopt.com/jam_double_chill_speaker_how_to_turn_on3fgjl.pdfIn PDF document text
    • http://dk-inc.xyz/integrated_chinese_4th_edition_volume_1_character_workbook9efis.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/5559878799.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/master_cleanse_daily_recipe.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/hp_elitebook_2760p_ram_slots.pdfIn PDF document text
    • http://national-verifyteam.com/dabokogefa7bjdq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ginowane.onlinewebshop.net/66451320812.pdfIn PDF document text
    • http://bitines.myartsonline.com/40308573633.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_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 5288 bytes
SHA-256: c726940b636d7a24b6040bb367f76dfe98b9592f81a022b62630a9bb87ef4656
font_01_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 10816 bytes
SHA-256: 71133a038abe6840b9fe13b1c675b691d34910407701362355d82f80096e27a9

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