Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9ddc13bc1ae7ac…

MALICIOUS

PDF

133.7 KB Created: 2021-03-13 22:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d4242b0ddf206c331348484c95eccb5 SHA-1: e517165eb159c72f5a56e3e1495c258f0d74d297 SHA-256: 9d9ddc13bc1ae7ac722ebb56c3949d637976a8c5d36d4c48df503dacf8a038a9
164 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one prominent URL being https://midufefew.ru/wix?keyword=freeciv+installation+guide. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and external link farm suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/wix?keyword=freeciv+installation+guide
    • https://cdn-cms.f-static.net/uploads/4450504/normal_602a1a6a33876.pdf
    • https://cdn-cms.f-static.net/uploads/4414679/normal_603a0eef8c309.pdf
    • https://nugobobunebiset.weebly.com/uploads/1/3/5/3/135303429/wememolulilozex.pdf
    • http://kufejat.sportsontheweb.net/bsc_pcm_syllabus_2020.pdf
    • https://dodoxatufasiw.weebly.com/uploads/1/3/2/6/132681482/kizurixapas_razedalazilar.pdf
    • http://vodizurulenega.mypressonline.com/33522502488.pdf
    • https://static.s123-cdn-static.com/uploads/4466661/normal_5fff9430894d8.pdf
    • https://cdn-cms.f-static.net/uploads/4475992/normal_603ff050c6b8b.pdf
    • https://pajilolupifi.weebly.com/uploads/1/3/2/3/132302794/vefoko_nozexegile_tobodomit_jagubuvoxamede.pdf
    • https://cdn-cms.f-static.net/uploads/4409093/normal_602e77de5076e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_65ae639e77ad4ea5b98fa0301b5be07c.pdf?index=true
    • https://s3.amazonaws.com/nefagolom/davaritemaxenod.pdf
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_cd6aad8c99704f95a3243ebffe611fc3.pdf?index=true
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_41e46b17ab2c4b75b489c9bc00df29c1.pdf?index=true
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_fd6bf37dcc064d4ba1420bbdbc119a2b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bb9eb874-1547-4ebf-8895-41d7a0a5b26b/what_does_pmd_stand_for_in_special_education.pdf
    • https://uploads.strikinglycdn.com/files/ed9b134b-3bb2-4cff-9c2b-3a3c38e45b23/whirlpool_dishwasher_wdf320padw1.pdf
    • https://s3.amazonaws.com/jotizifime/49780941646.pdf
    • https://uploads.strikinglycdn.com/files/9c229788-7e50-49f9-b68a-c932be985304/how_to_set_up_casio_watch_f91w.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/komobabiwifelito.pdf
    • http://resilasijajatil.myartsonline.com/45425768909.pdf
    • https://s3.amazonaws.com/geraromu/compaq_presario_cq5700f.pdf
    • http://badamowafe.onlinewebshop.net/66319894758.pdf
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_cacb7c5b586a403ca2a76a6ee8589765.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001adf1.bin
02be10c37c3090a8ac36874a70815980b7877a1c5dc76de10f46a430c5dc6dbf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADF1 5004 bytes
font_01_sfnt_off0001bf02.bin
8c340f1dddf2c6043a85149f61cddd7f1dca9c9a35377b8f869a5505f6355239
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF02 11168 bytes
font_02_sfnt_off0001e557.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E557 16204 bytes
font_03_sfnt_off0001fa84.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA84 4324 bytes