Malicious PDF — malware analysis report

Static analysis result for SHA-256 578bc424c64fd5a9…

MALICIOUS

PDF

93.7 KB Created: 2021-04-03 00:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d8656b0b3a98b6b03947469b0659073a SHA-1: 9d6bfe92b559bfbbdd28e4265fc78ac88a4b3969 SHA-256: 578bc424c64fd5a907ed3eaceb0d6657e3c4b542b0b488442f12336e1165e15e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URL 'https://resalured.ru/strik?utm_term=what+is+the+spotted+lanternfly+natural+predator' and the link farm URL 'http://pifevowomekol.22web.org/93830599318.pdf' are the most prominent IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=what+is+the+spotted+lanternfly+natural+predator PDF link annotation
    • http://pifevowomekol.22web.org/93830599318.pdfIn PDF document text
    • http://wonikugemozu.iblogger.org/how_do_i_know_which_weber_spirit_grill_i_have.pdfIn PDF document text
    • http://lazadoso.iblogger.org/medanta_gurgaon_reports.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_69aa21ec8a3a4406994b65a760fd7bac.pdf?index=trueIn PDF document text
    • http://babokad.epizy.com/sap_abap_basics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fca66669-5011-4e8e-949e-7d879fc1f784/cuisinart_cbk-110p1_bread_maker_manual.pdfIn PDF document text
    • http://dovudegumigisaw.rf.gd/how_i_lost_weight_going_vegetarian.pdfIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_c2bee468810144ab9eaaad3ba7970fe0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9813b730-975a-4463-b495-c7bd8826b036/kexofulexulasekixetov.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_83ead2ba002a47eb88e933f303402e1f.pdf?index=trueIn PDF document text
    • http://tewidunutazi.rf.gd/lsv_asset_management_proxy_voting_guidelines.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_4da74bf2155343129e51527257220ca7.pdf?index=trueIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_324fed70533845dbb6e17e8c2b59b1dc.pdf?index=trueIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_818021a93eee4a099be94cc666a8e907.pdf?index=trueIn PDF document text
    • http://rixuzomobe.epizy.com/rotukaxaranitotenoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fc60fe8-9f5f-4479-a199-81a24a776282/fonalegelemufivadu.pdfIn PDF document text
    • http://zoponoz.epizy.com/8118787637.pdfIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_67add6dce6494b1b85950f49ab65ff54.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_3d8ac67c99b84b199945b61c7574e372.pdf?index=trueIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_7f099d60f0784065b9320ad3c7be7fc3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6e627ef-9d0e-470f-8f8f-069bb61936d5/fukilonatuwubikad.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_d407cc3c6ffb4c32910046df75410627.pdf?index=trueIn PDF document text
    • http://ruxomipeb.epizy.com/15269890818.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_75a9530d265141ecb66baf210a8bcff4.pdf?index=trueIn PDF document text
    • http://moniladipawi.epizy.com/polycarbonate_roof_sheeting_australia.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_off000131ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AE 5244 bytes
SHA-256: 4095b6396f47a00e969e95dca306b0b65c48f8962141da197eba060d848af711
font_01_sfnt_off00014392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14392 11128 bytes
SHA-256: 7f9ef55c54766cc407dc570b1469a01403cb4ccc43c5d86f076bd864eacb74b4