Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a38709bbd796a73…

MALICIOUS

PDF

77.7 KB Created: 2021-03-10 21:00:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 027971c5c4339d61eb14ffd8f78b0a6d SHA-1: c21c0c6685880ca047e5042360bcb78e06607a5c SHA-256: 5a38709bbd796a73e983dd65a58eb60cab684ac1bd24dd9cd17e83faf1beff47
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or directing users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://midufefew.ru/123?utm_term=array+data+structure+in+free+format+rpgle PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384469/normal_602c660640366.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459467/normal_600f74b241e84.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/egcgcja/27035443858.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/J7ifzgj/civil_war_1863_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/ahct8ha/srs_airbag_system_malfunction.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_6009f1e88802e.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/jh0xAjc/android_box_mini_m8s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/306777ae-2189-4d36-8987-b631a1a3e94e/69343488978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d4a2a6-128a-4cb1-9dae-0f2b11739c3f/34648373217.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/phet_simulation_bending_light_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3adea6a-d668-477b-866c-7e29abe40dbb/the_coldest_city_in_the_world.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_77239a19fb694c3999029ab1f2f3672d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/143378a6-f7ce-4c78-a830-e93513937ef3/bowapoxipoxefa.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/vunopewubul.pdfIn PDF document text
    • https://bd04a250-715b-4db0-8087-55ec2f714cf5.filesusr.com/ugd/0c2191_800e861fce254d778452bf28359ddfb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8c0608-870d-416c-907b-8f51e5b63c18/53467818402.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_off0000e801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE801 5564 bytes
SHA-256: 78e8c3db11afdbd7cdde0d1c7689cefd5b852256a78a321a160de7b4280b2540
font_01_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 14600 bytes
SHA-256: 81b69bf565a6d32f7f6327f0deefc296039fb1e7c58480b1af5de90dec00394e

Open this report in the interactive analyzer, or submit your own file for analysis.