Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b28ec124f2f28c4…

MALICIOUS

PDF

86.2 KB Created: 2021-03-20 03:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 824932424cb86c796ad702c8a9ed3f34 SHA-1: 18a079028135d23ebcb377163abab3b67cfd4186 SHA-256: 0b28ec124f2f28c493459c81cfbf4dc0715bb3e1dd44a99a376d15ca5fa082de
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious content.

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 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://pelibifir.ru/wix?keyword=akc+boxer+breeders+ny PDF link annotation
    • http://lixodamevurobar.mygamesonline.org/how_to_start_a_sportsman_2000_generator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446512/normal_5ff9ffcd6b98a.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/monster_slice_pizza_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_603e2bbd5b35b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6025c2f618e0c.pdfIn PDF document text
    • http://voseboler.iblogger.org/89156678375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375541/normal_600932c3a33ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_6035bf913a544.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_7fc4ecd45dc1484daf08d9694550c40f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7002bc33-05e6-428c-bc9d-3f948dcb3971/besuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb41301-6009-4f53-bb38-a0d54ca38349/araby_james_joyce_summary.pdfIn PDF document text
    • http://nukoxosexi.rf.gd/89708881210.pdfIn PDF document text
    • http://zoxuwabemowel.epizy.com/nubawutawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0287fde1-4c1e-4167-bf40-07ea65ca2bae/el_caballero_de_la_armadura_oxidada_resea_descriptiva.pdfIn PDF document text
    • http://jugozuzojo.rf.gd/29719116323.pdfIn PDF document text
    • http://valogaberel.rf.gd/28651164370.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_c90d6194d9b94f9a9905cf40516e57ef.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_85ed180406424eb283612dc0bb811b12.pdf?index=trueIn PDF document text
    • http://varoniwarovez.rf.gd/gilaworutixezefibiwudod.pdfIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_720259872143414fb9a8124625e1d1d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9efdc0-d3be-45a4-8c2a-32f11df9572b/38185511793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/989fe5fc-ad75-44ae-a1db-c5016e123d3c/tusowagujosala.pdfIn PDF document text
    • http://pirajog.epizy.com/24484739398.pdfIn PDF document text
    • http://kaxegukepoxar.rf.gd/capacitive_voltage_transformer_in_substation.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_off000111be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BE 5056 bytes
SHA-256: ef1e5e30b72662cd49a5b1e4856abc2f8dea19878a47209671a466c73aadd22e
font_01_sfnt_off0001230e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230E 11832 bytes
SHA-256: ceb04451c3ff1523cbbad69d792f4ff81e6b1ad5ac549c605263ccdb94ae779c