Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83d622149b42a8b…

MALICIOUS

PDF

81.9 KB Created: 2021-02-19 11:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e0aa435854eaf67fcf5a947f6a6daff SHA-1: 14c9a8e52712e54782cf362ad90541e567b5c9c3 SHA-256: c83d622149b42a8bc331c03c1faa80847346ac5b22473d5b7848577c9728d804
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to domains commonly associated with SEO spam and link farming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or distribute further malware. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/wb?keyword=how%20to%20adjust%20upper%20tension%20on%20sewing%20machine PDF link annotation
    • http://rivuxini.66ghz.com/71011934888.pdfIn PDF document text
    • http://salufogi.iblogger.org/29547506273.pdfIn PDF document text
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/vemapiwagomuxij.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/can_elephants_be_pink.pdfIn PDF document text
    • http://lofupijuwox.22web.org/40355273650.pdfIn PDF document text
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/mugedujozo.pdfIn PDF document text
    • http://tifizifojaf.iblogger.org/13063085945.pdfIn PDF document text
    • https://zewakifu.weebly.com/uploads/1/3/0/7/130740590/ff78d85c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gumagabu/leon_county_booking_report_october_6_2019.pdfIn PDF document text
    • http://zogaxemajov.epizy.com/how_to_wear_navy_blue_shirt.pdfIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/madis.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/what_is_a_mental_strength.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/nenule.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/indian_flag_full_hd_wallpaper_1080p.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 5468 bytes
SHA-256: 17adfeefb66dea4ff0d2adbd150f9ac49e5740edaa5995b40448d49cc78aadc9
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 10668 bytes
SHA-256: 7f1cbe069789384bb1ea52166dc93060941e9914a2e5a4e5fd89f100ab0e6fa8
font_02_sfnt_off00012bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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