Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a8be3a45e2c653…

MALICIOUS

PDF

77.6 KB Created: 2021-03-14 16:53:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4c0201316ba4b5dd26c288b83ee62a0e SHA-1: 2206923bbcd290c308a7c3c1b2728bcae250a986 SHA-256: 06a8be3a45e2c653500b15bcd54c2acaf8ff2c364ec30b70e9a170e36ef66ab0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

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.
  • 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://resalured.ru/strik?utm_term=how+to+set+my+la+crosse+atomic+wall+clock PDF link annotation
    • https://cdn.sqhk.co/lemipetukaso/jt7c2GT/brother_hl-_l2321d_software.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/98306742505.pdfIn PDF document text
    • https://cdn.sqhk.co/wabitakenina/idhhpmg/sms_forwarding_android_apk.pdfIn PDF document text
    • https://wutusexiradolo.weebly.com/uploads/1/3/0/9/130969471/354078.pdfIn PDF document text
    • https://cdn.sqhk.co/gujipiror/jcBVUm7/traffic_rider_2020_apk.pdfIn PDF document text
    • http://zakofuta.66ghz.com/tulisan_arab_asmaul_husna_dan_artinya.pdfIn PDF document text
    • https://rafopovuweke.weebly.com/uploads/1/3/2/7/132740485/1422030.pdfIn PDF document text
    • http://gojovobikazed.iblogger.org/makerbot_replicator_2_filament_guide_tube.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/30458952783.pdfIn PDF document text
    • https://cdn.sqhk.co/mudonisogub/jbhfhg5/yahoo_games_text_twist_1.pdfIn PDF document text
    • https://cdn.sqhk.co/zetuzire/hqNSihj/change_eye_color_surgery_contacts.pdfIn PDF document text
    • https://sefizofemaj.weebly.com/uploads/1/3/4/2/134266575/2707013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vizomokirasu.epizy.com/what_degree_does_a_medical_laboratory_scientist_need.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/fekanisuwuvixuzubokej.pdfIn PDF document text
    • http://fawogalupa.epizy.com/automated_testing_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/99524285234.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/76019699798.pdfIn PDF document text
    • http://wotidupodugi.myartsonline.com/62885150862.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/bazogojotibopepefotokikuv.pdfIn PDF document text
    • http://pumuroxojab.rf.gd/how_to_write_a_lab_report_apa_style.pdfIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/macbeth_play_shakespeare_globe.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_off0000f374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF374 5164 bytes
SHA-256: d71a05092e72ed95e1768c41761b476cbcd1a344c378cdd83c53589d2d803506
font_01_sfnt_off000104fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 10440 bytes
SHA-256: 84888ecd85f86b7d48a9e74426747a5258cb030b2e3cde91bd9b41b76677b79d

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