Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a11704b11d7368d…

MALICIOUS

PDF

91.8 KB Created: 2021-03-03 14:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 52617ed3a90bc59dde0aa8b452e932fa SHA-1: cbfe07534875cfc81fe119598f7fbce2b4cdd583 SHA-256: 6a11704b11d7368d637216f1349d4df56bba4a1fd30b8c078b68b9309534134e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to URL generation, reinforcing the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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/award?keyword=does+lemon+water+help+lose+weight+fast In PDF document text
    • http://hookup157.fun/boney_m_song_daddy_coolucmxm.pdfIn PDF document text
    • https://fifimijo.weebly.com/uploads/1/3/4/7/134748793/2541354.pdfIn PDF document text
    • http://dumagut.22web.org/27869977911.pdfIn PDF document text
    • http://copyright-supporthelp.com/353532636796gj82.pdfIn PDF document text
    • http://rp-youtube.fun/mawunoxegotikumutodage1sdz3.pdfIn PDF document text
    • http://boomerangoo.site/zimuzejibemuturoboew4sy.pdfIn PDF document text
    • https://gadabuji.weebly.com/uploads/1/3/4/7/134715747/supavikanuduposozawa.pdfIn PDF document text
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/kukofutipijuwe_tonuvozubup.pdfIn PDF document text
    • http://repair-foto.ru/roxewavibcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_60176d20ca1c9.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/zavojugaw.pdfIn PDF document text
    • http://sevesasineja.22web.org/punageno.pdfIn PDF document text
    • http://uniques.space/al_capone_does_my_shirts_novel_study3n8lc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365653/normal_60244592c3660.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/62047052826.pdfIn PDF document text
    • http://sfr-espace.best/vevethwy5s.pdfIn PDF document text
    • http://zuzepamizavadon.iblogger.org/my_samsung_gas_oven_is_not_heating_up.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/vasutumovemusiminenedataf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501482/normal_6037fb341b704.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
    • http://musepojomu.rf.gd/99711729886.pdfIn PDF document text
    • http://jeduvuvojupan.rf.gd/who_viewed_my_profile_apk_whatsapp.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_off00011cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCE 5196 bytes
SHA-256: 43f75676f6aeadacd829e3d1e16d71b6a796daaff9ea18080b008f8ef9a58d85
font_01_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 10772 bytes
SHA-256: 65de2660ae5ca406642c32f84df8bd7d3cf388aad493d6976f08593eec59d4b9
font_02_sfnt_off00015318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15318 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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