Malicious PDF — malware analysis report

Static analysis result for SHA-256 3819a08083c810f8…

MALICIOUS

PDF

65.3 KB Created: 2021-06-01 14:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1df099197579cc08cf6cc57e7e13e29 SHA-1: 033e874465da5234cad8ed4cb9f6fd34b11ffd22 SHA-256: 3819a08083c810f80c2022e3b2f43b9e97fc50d47fdc07cfdb720bf106cc5b22
154 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO manipulation tactic. One embedded URL points to 'smidgel.ru', which is likely part of the malicious infrastructure. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://smidgel.ru/pbw?utm_term=what+makes+something+a+casserole
    • https://sesizapilutib.weebly.com/uploads/1/3/4/2/134266568/lilivigiget_fopuxaroluledaf.pdf
    • https://vuvowopivuvi.weebly.com/uploads/1/3/1/4/131410126/df972de9ee150c6.pdf
    • https://boginajidu.weebly.com/uploads/1/3/4/6/134693166/gazijazisiw_rabopisinu_kikalafa_setoberumif.pdf
    • https://kowevufewes.weebly.com/uploads/1/3/4/3/134388306/garelo-posagofor-kokiwevusolat-sowep.pdf
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/796a2e49600d340.pdf
    • https://zojufagilazit.weebly.com/uploads/1/3/0/9/130969654/83fc16c1.pdf
    • https://cdn-cms.f-static.net/uploads/4450154/normal_602f4591b2f17.pdf
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/3735003.pdf
    • https://dituwugo.weebly.com/uploads/1/3/4/2/134235792/madowunolipenisazubo.pdf
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/losulezemoxu_gekepowi.pdf
    • https://cdn-cms.f-static.net/uploads/4369643/normal_60303cabe6694.pdf
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/sixexojuneba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d89ce54c-e0b4-4b57-8968-c5e051da7cdc/descargar_la_biblia_en_audio_reina_valera_1960_gratis_para_pc.pdf
    • https://uploads.strikinglycdn.com/files/7d968ceb-7bd2-4bab-addc-f11f052d7af4/marionettes_inc_movie.pdf
    • https://uploads.strikinglycdn.com/files/18f9a379-1d4c-4ff9-adbd-e9ea9eaab481/everyday_use_by_alice_walker_commonlit_answers.pdf
    • https://uploads.strikinglycdn.com/files/78fdfe01-2ca8-456e-88dc-cd2d22dd1e6b/44795760141.pdf
    • https://uploads.strikinglycdn.com/files/81663cd8-6997-4013-8c25-ca9f23f2f63c/how_much_weight_can_i_lose_with_detox_tea.pdf
    • https://uploads.strikinglycdn.com/files/77bb3c86-2c3f-48bc-9113-4f394db5ef40/57023772953.pdf
    • https://uploads.strikinglycdn.com/files/3fb11235-184a-4102-a313-c3204a389639/72310933067.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fa.bin
fb6677fb386b045c1261e9f00fc0dfc0be605b095d86305f315895645a7725a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 5288 bytes