Malicious PDF — malware analysis report

Static analysis result for SHA-256 106428f71193716f…

MALICIOUS

PDF

71.4 KB Created: 2021-05-24 02:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fc0dc6914db2e1c903241125570b369f SHA-1: 5d16c4d7033631fa8b68445a71987ae2606805f3 SHA-256: 106428f71193716f6c1add458cddb6c74ce7b226ba93ad0eb1640e98a3a9e374
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking documents, but one prominent link points to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest an attempt to create a link farm or redirect users to malicious content.

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://leonvi.ru/strik?utm_term=why+won%2527t+my+polaroid+300+turn+on PDF link annotation
    • https://vejugowe.weebly.com/uploads/1/3/4/5/134506523/06e91f515.pdfIn PDF document text
    • https://lupipoga.weebly.com/uploads/1/3/4/4/134402738/funibirusad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491687/normal_6063aa10db885.pdfIn PDF document text
    • https://gutavavoz.weebly.com/uploads/1/3/4/0/134000423/9561cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_601ec09713c2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_602ef208bb06b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411702/normal_600530d356122.pdfIn PDF document text
    • https://sorunamupojiwek.weebly.com/uploads/1/3/1/4/131407183/rapemirefojig.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/371762.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/jobavo/application_of_chemoinformatics_in_drug_discovery.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/2006_john_deere_gator_hpx_4x4_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/97174312702.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/movie_counter_archives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39ff560a-26a4-4496-9d2f-27dc638c4534/7369926779.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/mimugovuzelanedubovar.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/jelazexisafaneginowepozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64d071f7-6aca-4774-b075-d1b86f82762f/37261520260.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/46502612028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee3fc540-449d-4868-b4d9-356cd4895077/youtube_videos_horoscopo_semanal_profesor_zellagro.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_off0000d574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 5568 bytes
SHA-256: 14b70c792f7233cca26d4f87b728a57da2383bab4342225c1b06f029eb7ad1d5
font_01_sfnt_off0000e85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85E 12028 bytes
SHA-256: 6909567685ffc62d0b390bade2d00983630baaf0ae0bc347fc4bfc3fd4a9f17b

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