Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddf4a66d6387fb7…

MALICIOUS

PDF

80.6 KB Created: 2021-03-08 21:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4a9c7a33655b8c314080b725f3372778 SHA-1: e213a1758262ce724693da3863f602804a6de545 SHA-256: 8ddf4a66d6387fb7d043aff2fb6461780e817255ed9a01ee96c44a660015c50e
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, https://xezojetit.ru/aws?utm_term=how+do+i+improve+my+mobile+signal+at+home, appearing to be a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable domains, further supporting a phishing or malware distribution scheme.

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://xezojetit.ru/aws?utm_term=how+do+i+improve+my+mobile+signal+at+home PDF link annotation
    • http://rujitexoxobag.mypressonline.com/28835462842.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/warhammer_40k_index_9th_edition.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/how_full_is_your_bucket_video.pdfIn PDF document text
    • http://lisojuribopuwad.22web.org/antique_star_chart_poster.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_6037fe0aaa4dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487622/normal_60165a0a628da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369322/normal_5fef5e39139fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414175/normal_6038d8151394f.pdfIn PDF document text
    • http://givepamodugag.22web.org/xivos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458615/normal_5fce5d1fb84b2.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/how_to_pituitary_gland_meditation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satogitexuvo.myartsonline.com/29503975382.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_23b6c5ec069b4f80a6eea3f7a856a0d0.pdf?index=trueIn PDF document text
    • http://nisinukodepafix.rf.gd/43474474600.pdfIn PDF document text
    • http://sivigowukom.epizy.com/68987216004.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_1868c37621b84d8c85027c27178ec2ca.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_b735f99a384e4fb1b7a837ec0de668d7.pdf?index=trueIn PDF document text
    • https://0dd4521b-3e41-4083-9bcc-807cce03ae78.filesusr.com/ugd/cfe2e9_9257c223379d4266a0289e88f1047f43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6068e932-2d7c-48e2-8ed6-421a4cdeeb0f/52628721951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4343ae01-fbbb-41ac-9953-7bb33e75b55b/what_was_the_pax_romana_why_was_it_given_that_name.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_ce0ce71f3deb46ef8421e34eb1d5ea8a.pdf?index=trueIn PDF document text
    • https://e064a861-6c7b-46af-b67a-66be1f32d776.filesusr.com/ugd/ec3e4b_08423f540fab4fbcbd9b16c9e54519ec.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_9cb17833ca734a0981f2ef74ee5dfb32.pdf?index=trueIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_27893485a1d942688daa22ec51b1cc6f.pdf?index=trueIn 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_off0000fc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7F 5728 bytes
SHA-256: 20a5bf1529131486f727ed975a081bf401024dd7a1b1035056e92d195290816f
font_01_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 10684 bytes
SHA-256: 8d1755ed3b8f7f3a0cdf0a2015d7919e2311e1f3ee1320f8c58365b5822bd8ed