Malicious PDF — malware analysis report

Static analysis result for SHA-256 c815710638cf27a0…

MALICIOUS

PDF

80.9 KB Created: 2021-03-28 21:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f4d44be3c519a893e3648f86586dce5 SHA-1: 7de63ac771c4153b078809e59160f749e5e660f1 SHA-256: c815710638cf27a0cd5941e4302d449a2ab5a691ca74c88053857d88685cb643
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to PDF files hosted on various platforms. This suggests a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware via the linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://maypoin.ru/wix?keyword=economic+effects+of+the+french+revolution
    • https://cdn.sqhk.co/dinokafoxume/hgey4kG/sasidibuzonufotabusiwaf.pdf
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/c1b2dfadd4c.pdf
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/958499.pdf
    • https://cdn.sqhk.co/felebamifuk/gijdjie/garidawamigajixomejarafu.pdf
    • https://naruvemekojesez.weebly.com/uploads/1/3/4/6/134685524/e74e9095041149c.pdf
    • https://sujofunipus.weebly.com/uploads/1/3/4/5/134502209/zaponajejaz_gexudokemimawe_dasukupove.pdf
    • https://xexafuru.weebly.com/uploads/1/3/1/0/131070851/digoxavije_zirex_pafugudativeba.pdf
    • http://sawemawe.mywebcommunity.org/dresden_files_short_story_order.pdf
    • http://farunoraxukiz.getenjoyment.net/790677799.pdf
    • https://cdn.sqhk.co/mukutosi/l61Jigf/the_banner_saga_wikipedia.pdf
    • http://xegisepereti.mygamesonline.org/ansi_b16._5.pdf
    • https://gimisezijumini.weebly.com/uploads/1/3/1/4/131453276/4294093.pdf
    • https://wizenavadabavor.weebly.com/uploads/1/3/4/5/134518239/891967.pdf
    • https://cdn.sqhk.co/fowifabibu/d4Zx12Z/golden_robot_car_transforme_futuristic_supercar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2379ff8e-c89a-4dce-bfe4-93d9903d94f9/what_is_a_good_mathematical_proof.pdf
    • https://uploads.strikinglycdn.com/files/a19299f9-9bd1-440d-89f6-5f90200d5fe0/14908137988.pdf
    • https://uploads.strikinglycdn.com/files/3f4e8ddc-646e-489e-8484-6c4effd2bb96/xujupar.pdf
    • http://vawinujofupin.myartsonline.com/71789180092.pdf
    • http://zibelasavu.atwebpages.com/catalogo_candele_ngk.pdf
    • https://uploads.strikinglycdn.com/files/563da8f3-7a7f-472e-b27d-dff47c36c3de/lenovo_ix4-300d_manual.pdf
    • https://uploads.strikinglycdn.com/files/1244a3f8-03c3-4d9f-8a3f-a0b588edeecc/100_gr_harina_cuantas_tazas_son.pdf
    • https://uploads.strikinglycdn.com/files/58f6f1cd-e7f7-40f4-9940-9466f362e186/how_to_program_clicker_remote_keypad.pdf
    • https://uploads.strikinglycdn.com/files/e7438c05-8283-468f-a48a-b127a02c3558/yaskawa_a1000_37kw_price.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010017.bin
7a7db45568a7f9f57f36b86770f15d3eceec383683457448fefcbd6e107800f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 4928 bytes
font_01_sfnt_off000110c5.bin
4b3b9ae36dafb44ac7f1b5b408fcb575b9d88a111266f919f745571b90c9e382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 11280 bytes

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