Malicious PDF — malware analysis report

Static analysis result for SHA-256 948ec2b68fc575c4…

MALICIOUS

PDF

72.1 KB Created: 2021-06-03 03:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1ec2674693400a5c28259c2b1def2856 SHA-1: f2c42ada7a7661d63446190c6704f959499363b4 SHA-256: 948ec2b68fc575c4b4e4990aeeac4ab395fcaa3cee73c24e1ca2f171a97ab6d6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. One prominent URL, 'https://smidgel.ru/pbw?utm_term=how+to+fix+nvidia+driver+update+installer+error+windows+10', is likely part of this scheme to drive traffic to potentially malicious or deceptive content. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

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://smidgel.ru/pbw?utm_term=how+to+fix+nvidia+driver+update+installer+error+windows+10 PDF link annotation
    • https://wiwetone.weebly.com/uploads/1/3/4/6/134660192/larinogexiteka.pdfIn PDF document text
    • https://nusavudusegi.weebly.com/uploads/1/3/4/4/134444144/25d21.pdfIn PDF document text
    • https://wuwuxetu.weebly.com/uploads/1/3/4/8/134897280/6361770.pdfIn PDF document text
    • https://borotopod.weebly.com/uploads/1/3/3/9/133997632/fexupupele.pdfIn PDF document text
    • https://dubuweni.weebly.com/uploads/1/3/1/6/131637072/jobatusag_saxak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tebejeloxid.pbworks.com/f/what_are_similes_in_metaphors.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/how_to_treat_severe_sciatica_pain_at_home.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1691da32-9f97-433a-88df-cb507a734bd4/star_wars_d20_saga_character_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76b6282-290e-4a15-9f10-9dc88f77e6ad/echo_pb-250ln_25.4cc_gas_powered_leaf_blower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a5e300-05ea-48ad-b39a-6e5f867abd1b/towobukadiput.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867aaf71-cd11-43c8-bbe2-852302b0c6c7/sozutadixokawero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb6d215-a4d0-4764-ba25-1626d58c5496/fusokomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349c1717-8acc-4afc-b3a9-1fcacd3a626f/delta_34-444_table_saw_manual.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144412116/how_to_identify_herpes_zoster.pdfIn PDF document text
    • http://vadibun.pbworks.com/f/47406610779.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/f/how_to_put_header_in_excel_sheet.pdfIn PDF document text
    • http://nitezug.pbworks.com/w/file/fetch/144519393/gta_san_andreas_highly_compressed_200mb_pc_windows_10_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af2b3b4-6d69-4551-8234-0ef36822825e/58685766879.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/can_you_lose_money_in_the_tsp_g_fund.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b12e6228-305c-4595-a51e-03e057c26d26/hz_yaynlar_8.snf_trke_akll_defter_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0979ef1-c365-4b94-b4e2-f2c89c184b2d/genaparodibexozukapowolus.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_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 5412 bytes
SHA-256: 87766b25ea3205b5a820fb2e435039ade7096b1f3819cbfd68b575cf7553dc66
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 10800 bytes
SHA-256: 22ae435206da0f7463637e7b1203b0498c1a0c584492aa1ba08f108b559695cf