Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a013d0b7271cae…

MALICIOUS

PDF

83.6 KB Created: 2021-03-28 08:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f3e4935efa8cfb0173cb43fe4d6de1bc SHA-1: 56bc57c4de66ca96e6e52a7a70aa2b25f819acd3 SHA-256: 67a013d0b7271cae60518d4dd541b1be36dd79217d16ee46b40a09ec3679ea57
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation attempt. While no scripts were directly extracted, the ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution via the linked PDFs. The embedded URLs are numerous, with many pointing to S3 buckets and Weebly hosted PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://xowavexinoj.weebly.com/uploads/1/3/1/4/131408618/sizamibiwe.pdf In PDF document text
    • https://fixoxotogixas.weebly.com/uploads/1/3/4/3/134374926/zifilojupiremo.pdfIn PDF document text
    • https://witokilufixag.weebly.com/uploads/1/3/4/7/134739393/7576756.pdfIn PDF document text
    • https://nokifafib.weebly.com/uploads/1/3/4/5/134597692/2476500.pdfIn PDF document text
    • https://benixufo.weebly.com/uploads/1/3/4/6/134660079/4486706.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/yhbXhdM/33805020756.pdfIn PDF document text
    • https://cdn.sqhk.co/tezakagadol/gigifif/viganiva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=is%20there%20really%20a%20cloud%209%20storePDF link annotation
    • https://s3.amazonaws.com/jonora/wepufulomaza.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/12171885240.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/3351426102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9deb41-41cb-45bf-8a7b-f86d38d796b3/memijo.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/bollywood_movie_2019_site.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/56785914607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab8cf02-991d-486c-927b-b0dfe3d56b32/what_is_the_best_book_of_the_bible_for_a_teenage_girl_to_read.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/58339238658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6caea0-06ef-42c7-b994-b18a597bd7e3/how_to_calculate_boiling_point_with_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/fishing_planet_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/61917919417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65006c01-cce1-4282-bfa6-d75105278978/beleviwoxuxizoneku.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/zululeremupirabuwulusoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe194ced-a4cd-475b-b4eb-505765686291/basic_electrical_engineering_course_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/sepepimogadinelapotot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b21fd41-fb1d-42dd-aa5f-9541239e8d12/97736889633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d29587e-91cb-4ad1-8af0-d85bbd47871d/compare_epson_v700_vs_v800.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_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 5220 bytes
SHA-256: 449dc9d809d577355810ef6f8e4ceb38bf478b43ca07cab943996c9efa052430
font_01_sfnt_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 10740 bytes
SHA-256: 8c40596c32b09c4a443277c70cb03c87bfb6205916f8b3689ddadc5478fd8f98

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