Malicious PDF — malware analysis report

Static analysis result for SHA-256 c822cb98189ec0ab…

MALICIOUS

PDF

90.5 KB Created: 2021-03-15 06:40:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b817b89c0f12e2559c7529aba4d7786a SHA-1: 8c62b2ae52ac8dd0bc48d1dc4638d70f66c6acca SHA-256: c822cb98189ec0ab93b68e770e15050a87eaad3c007d6daedc1ab6a3f140b326
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://resalured.ru/123?utm_term=english+worksheet+for+class+2+kvs PDF link annotation
    • https://cdn.sqhk.co/xevowuto/hjih3Qw/mens_hairstyles_fade_sides_long_top.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/ibC0mcN/swing_sets_costco_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_6025d0560abf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fee6213b4f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_602a1c43464bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465006/normal_5fe47a6c4d84d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_603b05b5c9b36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495395/normal_5ff1ec1f4cf48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460447/normal_604ec0f8c3ca6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/3943dfcb-8669-48b6-9e42-cf7de474cb12/momiwawutuwasimajazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de96a890-4ae2-493b-97ee-50375642ca4e/to_train_up_a_child_by_michael_and_debi_pearl.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_d716adb8259a446c806a3d8c7053f0a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/879c98bb-9f56-42a7-ba26-6bc67a0e56ef/nenibopivawaserovasotawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16359c84-da99-4dd9-94fa-7867a67fd751/fubotarokivotola.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_c13fd09053a24f5eb4bc913c19eb0c72.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_a3774d48519f4955ad6822483d95c62f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8d6bee-81bb-40b3-a944-6348c20b8d1e/8439258388.pdfIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_23753281280540619a3494cc33f2e866.pdf?index=trueIn PDF document text
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_0bf8732cb93647c3b86f820acd78e976.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 5448 bytes
SHA-256: 0377784ef7f51a894dfa33fbc028687c4a23857272359a38d96c1415d352c339
font_01_sfnt_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001133e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 11348 bytes
SHA-256: fb818a66e5566be8fc91c55df00ca915e71fb9a712afa943f2a076f511dd4e5d
font_03_sfnt_off00013a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 10608 bytes
SHA-256: c873342babe987578bd2d0be984a9c86fe22b38188d21afdd2bc5eb669886d51

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