Malicious PDF — malware analysis report

Static analysis result for SHA-256 70635046e0cf2376…

MALICIOUS

PDF

114.3 KB Created: 2021-02-18 18:01:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a404bbdc95430614ed58f368a211523e SHA-1: df71b48c7c89a66f5b921adaa8d1fa46bf64d0f2 SHA-256: 70635046e0cf23767133d5cd248e3abda03843e86b8f78e12c0e84feb4d2c6d5
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious domains and redirectors, indicating a link farm designed to distribute malware or phish users. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM', strongly support this assessment. The ML classifier also flagged the document with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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/strik?utm_term=download+tabel+asmaul+husna+dan+artinya+pdf In PDF document text
    • http://todayit.pro/96769349872kygyu.pdfIn PDF document text
    • http://czecheducation.space/sirovajoxetutomekopoxenuogp24.pdfIn PDF document text
    • https://lepopitiw.weebly.com/uploads/1/3/4/7/134762721/4515492.pdfIn PDF document text
    • http://cadenalia.com/44309263121h0oan.pdfIn PDF document text
    • https://wituzizotavukoj.weebly.com/uploads/1/3/1/6/131606330/5377417.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/5f0b7.pdfIn PDF document text
    • http://cmbclientes.com/61315718064r73vu.pdfIn PDF document text
    • https://delovamubikener.weebly.com/uploads/1/3/4/7/134707073/pojidobuv_kenalolonuf_mimobop_jeboruzitol.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/6373721.pdfIn PDF document text
    • http://changely.club/how_to_fix_sheetrock_tape_cracks2b4u0.pdfIn PDF document text
    • http://eagleaff.com/what_is_the_21_day_sugar_detox_diet6q1x8.pdfIn PDF document text
    • https://dajusokododolin.weebly.com/uploads/1/3/5/9/135964726/b2f0d9c5.pdfIn PDF document text
    • http://itrom.fun/4_conceptos_de_contabilidad_y_sus_autoresw5avz.pdfIn PDF document text
    • https://rukupapafi.weebly.com/uploads/1/3/0/7/130739745/e7b23023f0f60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://metoxitaneg.epizy.com/balkanska_mafija_serija_sve_epizode.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/accepting_payment_on_google_forms.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/2534162.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/definition_of_coliform_in_biology.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001882c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1882C 28200 bytes
SHA-256: 8be2fbf390bbf8d79b88f2f99f519b5a802281f0789553a4ccfa26a0b81e377e
font_00_sfnt_off00012a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8E 4216 bytes
SHA-256: 7578683c08ae07f71545543b9883e2cf150b0a804d6c1ea11467737b2c90d828
font_01_sfnt_off00013931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13931 5616 bytes
SHA-256: 23236b6a1e5c38d7e1fa28d489829d4716a15c5cc7dc4e8b12334e7ad39714ab
font_02_sfnt_off00014c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2A 6296 bytes
SHA-256: 7c7ac0107d00c433a88004bed7e8704a2a6a1f345ac979a14099a5bc471a6a44
font_03_sfnt_off00015c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C9D 13948 bytes
SHA-256: f9e1afc9f80e6e4f9166edf436a19b174de6489a703e4652c263b3fca5162bda

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