Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf71c648dbb898d…

MALICIOUS

PDF

87.0 KB Created: 2021-02-28 13:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 80d55ff30a393e5a4d63ccbbc1c200b1 SHA-1: 18148c7f01eab5e5569d9d8a10ed4ec983cba03d SHA-256: bbf71c648dbb898d5ef4c1d1066484d2dff7f0e60013e9be94048e6f3503bd4c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. The document body, though obfuscated, suggests a lure related to a poem summary, likely to disguise the malicious intent of directing users to potentially harmful websites.

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://resalured.ru/strik?utm_term=stopping+by+woods+on+a+snowy+evening+poem+short+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4492901/normal_600a8db182a8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_600c01c1d9e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413590/normal_5fdab082bb9ca.pdfIn PDF document text
    • https://zesaxigupube.weebly.com/uploads/1/3/4/0/134016892/rezubami-xilatupexupukar-rirajumanitezin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_603b2532b9a9d.pdfIn PDF document text
    • https://muvilafopa.weebly.com/uploads/1/3/4/5/134502810/vifivoxevexolebaraf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_6027500ec4e38.pdfIn PDF document text
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/rebitanul_nozem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5ff8f07c00927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447646/normal_60118cb81349f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purawuma/bofifawijipe.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/what_is_the_2nd_percy_jackson_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/58946334958.pdfIn PDF document text
    • http://godorapibiveze.epizy.com/55610779158.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/idioms_anglais_franais.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/whistler_village_dining_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/mesosotakogafujikilapa.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_off00011565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11565 5840 bytes
SHA-256: 8235883f05f6fa81f85012177b1347d4a13584b22d88f3452ecd3a9aa6ff5dce
font_01_sfnt_off0001292e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292E 10896 bytes
SHA-256: 372cf62584ffaa3876b5d805b86c1369bd189cac7368582b69cd32c2e5e5e6fa

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